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jplxpto，I found some information for you
1.http://valexvir.narod.ru/      -----from Russian，for 40D, 50D, 5D Mark II и 1Ds Mark III -  record video 1024x680 with a pc.
2.DIGIC III - (VxWorks OS) from CHDK    http://chdk.wikia.com/wiki/For_Developers
3.one  chinese cracked the firmware of 40D，found out the "factory menu"；ISO 50-6400；AF CK;but he stoped （write text.bin），
http://bbs.fengniao.com/forum/1397306_8.html
http://bbs.fengniao.com/forum/1397306_9.html