You could build your own super bright blinkie. Here is the LED and driver board you need.
Driver:
http://www.dealextreme.com/details.dx/sku.7302
5 modes with three being steady on high, medium, and low, a flashing mode, and off. Low would be good for the MUP, medium to help conserve the battery in low volume traffic, and high so you can be seen from miles away!
LED:
http://www.dealextreme.com/details.dx/sku.1776
Extremely bright LED!