The main reason why tMan made is that there is no task manager which is HiDPI aware and respects taskbar theme. It should be a small application for closing and switching tasks. It should not replace whole taskbar functionality (like Wisbar and others do) and it should not have the switching feature in notification area (like Switch is done).

Features:
- Incredibly small.
- Icon for each task.
- Closing applications by one-tap.
- Closing and minimizing.
- Soft reset in task menu.
- Screen-off in task menu.
- Power-off in task menu (from 0.9.6).
- Screen rotation in task menu.
- Invoke the task list by hardware keys.
- Kill task forcibly (from 0.9.6).
- User-defined colors for foreground and background (from 0.9.6).
- List of ignored aplications (will not show in task list) (from 0.9.6).
- Exception list for Ok/Close button (predefined behaviour for selected applications) (from 0.9.6).
- WM5 style Ok/Close button (from 0.9.7).
- Localizations (from 0.9.8).
- WM6 style Ok/Close button (from 0.9.9).
- WiFi On/Off (from 0.9.9).
- Bluetooth On/Off (from 0.9.9).
- Compact Mode (from 0.9.9).

More screenshots here.

Update Description:
v0.9.11 (10-12-2008):
- Fixed one icon offest problem.
- Added Alt+Tab feature (short press to switch aplication, long press to open task list menu).

v0.9.10 (02-05-2008):
- Fixed: tMan was not integrated correctly into themes with a gray background.
- Fixed: Alt+F4 feataure removed, because it had nasty side effects (different on different devices).
- Fixed: Icons are square shaped.

v0.9.9 (11-01-2008):
- Added: WM6 support.
- Added: Compact Mode.
- Added: WiFi on/off.
- Added: Bluetooth On/Off.
- Added: Alt+F4 for closing applications.
- Fixed: If 'Desktop' item is not shown, closing of the first task did not work.

v0.9.8 (07-10-2007):
- Added: Localization enabled.
- Added: Icons for power off, rotate left/right, sw reset and display off.
- Added: 'Desktop' item in task menu is optional.
- Added: TWEAK: hide dot.
- Fixed: Better detection of notification bubbles.
- Fixed: Landscape switching issues.

v0.9.7 (02-08-2007):
- Added: WM5 styled buttons.
- Added: draw fixes and optimizations.
- Added: Tweak: Kill Timeout.
- Added: tweak: OldStyleButton.
- Fixed: Task List Accelerator was not saved.
- Fixed: internal improvements.
- Fixed: improved program icons on WM5.
- Fixed: closing applications from popup menu improved.
- Fixed: Notification bubbles do not show ok/close button (tested only on my device and emulator).
- Fixed: better detection of switching windows/button type.
- Fixed: phone closing fixes (tested only on emulator).
- Fixed: minor changes in GUI.

v0.9.6 (24-04-2007):
- Added: List of applications to ignore.
- Added: Application exceptions.
- Added: Minor GUI reorganization.
- Added: Kill task forcibly.
- Added: User-defined colors for background and foreground (TWEAK).
- Added: Power off item in task menu.
- Added: Show task operations in task menu.
- Added: Confirm dialog before soft-resetting the device (TWEAK).
- Fixed: Improved stability.
- Fixed: Action key closed an application at certain situations.
- Fixed: Task menu invocation rewritten.
- Fixed: Terminating tMan before installation (for upgrading).
- Fixed: Minor fixes.

v0.9.5:
- Fixed: Rotation aware.
- Fixed: Respecting WM5 background.
- Code clean-ups.
- And a lot of stability fixes.

v0.9.4:
- Added: Mapping of Close/Minimize/Show menu to Tap/Tap-and-hold/Gesture.
- Added: Soft-reset menu item (optional).
- Added: Screen-off menu item (optional).
- Added: Screen Rotation menu item (optional).
- Added: Task List can be invoked by HW key.
- Major code changes.
- Major optimizations.
- Improved stability.
- A lot of bugfixes.

v0.9.2:
- Added: Configuration dialog.
- Added: Tap-and-hold to invoke the task menu.
- Added: Minimize/Close action for Ok/Close button.
- Fixed: Icon drawing issue.
- Fixed: Minor draw fixes.
- Fixed: Landscape/Portrait switching.
- Fixed: Ok/Close button update issue.
- Fixed: Task menu is opened faster.
- Fixed: If the task menu is opened, tapping the tMan button closes the task menu.

v0.91:
- Fixed big close button draw issue (on devices with 240x320 display).

v0.9:
- First public release.
- Released mainly for testing purposes.

SOURCE

http://code.google.com/p/tman/

Reviews:

***** [Aug 16, 2008] by Bobby Dazzler using Dell Axim X51v
What a great program. Works perfectly. Just what ive been looking for. Would like the option to turn WiFi on/off as well. Thanks.

* [Mar 7, 2008] by Jai using Dopod D600
Surely the worst app I ever tried. You know right now what I m doing. Try to recover data from my Memory card whom it has damaged to extent of no return. Already have spent 2 hours to recover at least some data. No success. Thanks Andre.

***** [Mar 6, 2008] by AMAK using XDA Orbit-WM6
Excellent and will be perfect if wifi on/off option added.

*** [Jan 17, 2008] by vincentHRD using Palm Treo 750 WM6
inhybits some functions of the ALT button. A light feel of lack of responsiveness by the screen. poor compatibility with "UI twicker". Anyway very nice and useful. Thanks

***** [Dec 1, 2007] by User464 using HP iPAQ hw6915
Couldn't imagine to be better. Suits all my needs. Intuitive to learn, nice looking and fast.

***** [Oct 16, 2006] by Bob using Windows Mobile 5
This is PERFECT. He fixed the color so it blends in with WM5 now. It's exactly what i needed, a replacement for the Close button, no frills or extra baggage.

** [Jun 26, 2006] by Charles Grahm using hx2495
For WM5 users: If you don't mind having an off-color, ugly button where the default X used to be, this program is fantastic!

***** [Feb 8, 2006] by Paul using Axim x50v
I just downloaded tMan onto my Axim x50v and it is an excellent program! I have gone through about 5 of these tyoes of programs and this one fits in perfect. I wasn’t happy with the switcher bar that comes with Mobile 5.0 because it puts it right in the title bar and keeps me from being able to see the title of the window I have open. This is a problem when it gives info such as what section I am on in an e-book or chapter and verse on a bible. It is also like it because it is small, right in the area the X should be, and doesn’t slow it down like other alternatives. I like being able to hit the X and it actually close like it does in windows. One complaint. It doesn't blend in with the themes but that is a insignificant problem. Good job.

*** [Oct 19, 2005] by JD using Axim x51v
Easy to use, but would like the option of closing or minimizing when clicking the 'X', instead of having to remember to click the "dot" then "minimize" whenever minimizing. Not skinned for WM5, but not a big deal. Other than lack of user options, it's great!