Yes, these are reported to work well with many cameras...Canons included. When you order just be sure to order "Canon" versions.
I just ordered some of the 622C triggers this morning for my T2i/Yongnuo YN468-II flash combo. I hope to be doing some OCF (off camera flash) work soon and will be using an umbrella reflector so I'm looking for a stronger flash so I'm trying to decide on whether to purchase the 568EX model. Besides being a stronger flash than my 468, it also has ETTL exposure setting capabilities, and has HSS (high shutter speed) capability)...it's also several hundred dollars less than the Canon equivalent! If you get the 568EX II you should be "good to go" for quiet a while.
Be aware that some people have had an issue with their YN568's battery door failing (tabs breaking). It looks like these people are ordering replacement doors for around $6.00...so that's still a good deal, pricewise. There are several less expensive options to look at other than Canon brand...Yongnuo appears to be a pretty good one. Of course, if price is no issue...go with Canon. 
Best wishes,
Ed