Magic Lantern Firmware for T2i

Features:
* GUI menus: press the ERASE button to display them
* Bit rate control (QScale parameter) for the H.264 encoder
* Zebra stripes for overexposed / underexposed areas
* Spotmeter, histogram
* Cropmarks (16:9, Cinemascope, Fisheye)
* Simple intervalometer
* Trap Focus: camera takes a picture when something comes in focus
* Wireless trigger with the LCD face sensor & your own hand
* AE bracketing (like on 5D2 ML)
* Rack focus
* Stack focus (Live View only)
* Lens data computation
* Onscreen audio meters
* Manual audio gain, selectable input source, disable AGC and digital filters
* Display time remaining during video recording
* Debug functions (display CMOS temperature, screenshot, logging)


http://magiclantern.wikia.com/wiki/550d_install

Let me know how it works out. I heard about this through another acquaintance, but am not willing to risk my camera.

Me neither :-P I really don't know too much about this kind of stuff to take the risk yet

Interesting... says it will "brick your camera" if done improperly. I want the manual audio gain control. You first Akbar! We are all waiting for YOU.