Main features:

• Including sequences for normal, low battery, no-signal, new message (Voice/SMS/MMS/EMail), missed calls, appointments, wireless status (bluetooth and wifi) and charging level.
• Almost all sequences can be configured via the settings application.
• Sequences may include blinking the green and orange LEDs (in HD2 - may be configured in other devices), the keypad LED, vibration and playing a wav file.
• If the radio is turned off or there is no signal, another orange blink occurs (in addition to the regular one).
• When the phone is charging the orange LED lights constantly, every few seconds a sequence of green blinks according to the batter level occurs (20-40% - 1 blink, 40-60% - 2 blinks, 60-80% - 3 blinks and 80-100% - 4 blinks). If the battery is fully charged - the green led lights constantly.
• Blink interval and length can be set via the registry. Different blink interval for idle mode and when notification exists (new message/missed call).
• Running the link once starts the application, on blink sequence occurs. Running the link again runs the configuration application from which the service can be closed.

Click here for more information.
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Update Description:
v1.7 (13-09-2011):
- Fixed issue where Blinker halts at midnight (thanks gpobernardo).

v1.6 (20-08-2011):
- Fixed issue where custom LED id's where not saved.

v1.5 (13-08-2011):
- Added a notifications check when power state changes.
- Added 3 more custom LEDs.
- Shortcut link now point to the settings application instead of the service itself.

v1.4 (14-05-2011):
- Rewrote the service project in c++ (Now the service requires significantly less memory when running).
- Added ability to vibrate (see second post for further information).
- Added ability to play a wav file in the sequence (see second post for further information).
- Added sequences for "Appointment" and "New MMS".
- Blinker now uses only the WM notification method.
- Removed the "Use WM Notification" as it is no longer required.
- Removed the "SMS Store" setting as it is no longer required.
- Fixed issue where in lower resolution devices a scroll bar did not appear in the settings application.
- Added "Advanced" tab in the settings application.
- Added a "Wakeup notification" - this option will force the device to wake every couple of seconds. This should solve the "unattended issue" - but might affect the battery drain. This feature can be turned on under the "advanced" tab in the settings application.
- Hibernates when no blinking is required.
- Changed "AllowUnattendedMode" to "ForceUnattendedMode" and added a checkbox to control this value under the "advanced" tab.

v1.3 (06-04-2011):
- Blinker can now use the notification system instead of directly check the Stores (thanks peterpan911 for the tip). This can be configured in the setting, under "Use WM Notifications".
- Blinker can be configured to load on startup from the settings window.
- Improved performance (thanks p50kombi)
- Some minor interface improvement to the settings dialog.

v1.2 (10-02-2011):
- Added possibility to set the green/orange LED id.
- Added possibility to set the SMS store name.
- Improved error handling in case SMS store is not found.

v1.1 (03-12-2010):
- Added notifications for new message (SMS/EMail/Voice), missed calls and wireless status.
- Added possibility to blink the keypad light as-well.
- Added separate delay interval on new message or missed call.
- Tweaked the unattended mode. The halting problem still exists, but it seems better now.
- Added a configuration utility. To run it press the Blinker shortcut again (after blinker is already running).

v1.0 (06-11-2010):
- Initial release.