I wanted to mention Dewey's 24-Hour Read-a-Thon on October 24-25, 2009.
Dewey from Hidden Side of A Leaf started Dewey's 24-hour Read-a-Thon began in 2007 with 37 participants, then the second Read-a-Thon had 69 participants. There were 119 participants in Oct. 2008. Dewey passed away in November 2008, and so Hannah (WordLily), Ana (Nymeth) and Trish (Hey, Lady!) are continuing the tradition. As of today, 73 people have signed up.
I'll be visiting my brother in Boston this weekend before he heads overseas, so I doubt I'll be able to participate. It's too bad because it would have been a nice way to socialize with other bloggers and make a dent in my reading backlog.