http://www.dvxuser.com/V6/showthread.php?t=205561
excerpt:
RAW baby, RAW! New firmware will be released imminently for every camera from the Rebel T1i/ 500D through to the 1DmkIV giving it the much desired RAW recording on the memory cards. Not just that, but they have also finally unlocked the HDMI out to give us an uncompressed feed so we can plug in our Nanoflash or KiPro and record into a format that we have dreamed of.