Here are three main videos:

Hearings Part 1

http://www.c-span.org/Watch/Media/2010/05/12/HP/A/32826/House+Energy+Cmte+Hearing+on+Oil+Spill.aspx

Hearings Part II

http://www.c-span.org/Watch/Media/2010/05/12/HP/A/32852/House+Energy+Cmte+Hearing+on+Oil+Spill.aspx

Misc BP/Transocean/Halliburton Testimony

http://www.c-spanvideo.org/videoLibrary/event.php?id=184359