It seems that on the current firmware you can use the LED flash apps without the need for root. "FlashApp" by Damunix and "LED Light" by picolyl both work, the latter of which has a nice widget to go along with it. Both are available in the market.
As this pertains particularly to the Evo being able to run them without root, I figured I'd post here. If a mod wants to move it to software though, feel free.
