The hearing focused on testimony from four people (list from here):
Joe Wilson, former ambassador and WMD expertUnfortunately I wasn't able to watch the hearing live (it was only carried live on C-Span 3; I didn't even know there was a C-Span 3), though there are plans to rebroadcast the hearing on both C-Span 1 and 2 later tonight and tomorrow.
Ray McGovern, 27-year CIA analyst who prepared regular Presidential briefings during the Reagan administration
Cindy Sheehan, mother of fallen American soldier
John Bonifaz, constitutional lawyer
The hearing was covered, and written about, by a number of bloggers; here's some of what I've found so far:
Live blogging the Conyers hearing - written by a blogger (from Democracy Cell Project Blog) who attended the hearings in person; it's very detailed. Included in this post is the following information:
"HC-5, The Big Room for hearings that are held in Congress, is open, and has been open during this entire time."Historic 'Downing Street' Hearings Adjourn! - on BradBlog, contains their live notes.
The DSM rally in front of the White House - a DailyKos diary by peregrina describing the writer's firsthand experiences at the White House gates when Conyers arrived to deliver the letter.
Conyers is walking over to the White House - a Progressive Democrats of America blog entry reporting on Conyers delivering the letter (the last of many entries live-blogged during the hearings; start here if you want to read them all)
If/when I find an online version of the video and/or transcript of the meeting, I'll post them.
[Update: Found another live blogger who covered the event: The Tattered Coat posted Live Blogging The Downing Street Memo Hearings.]