A Mutawatir Hadith is a Hadith which has been narrated by at least four of the companions at different times and places.
Here is an online collection of Mutawatir Hadith - though it doesn't cover all Mutawatir Hadith of course - and there is (as always) some disagreement amongst scholars as to what consitutes a Mutwatir hadith (some don't define a number eg) and which ones are to be regarded Mutawatir:
http://hadith.al-islam.com/bayan/Index.asp?Lang=ENG&Type=3