Canon have a wonderful utility to take the heavy lifting out of transferring and converting h.264 files to ProRes.
First download this
http://www.usa.canon.com/dlc/controller?act=GetArticleAct&articleID=3249
Unfortunately is doesnt work with the 550D/T2i,

but one can make it work by doing the following
Go to Library/Application Support/ProApps/MIO/RAD/Plugins/CanonE1.RADPLug/Contents/Resources/
Open up cameras.plist, and after the 7D info insert the following script:-
<key>T2i</key>
<array>
<string>Canon EOS REBEL T2i</string>
</array>
Save the text file. Close it. Everything should work now. If you have the 550D then insert this instead of T2i