The Undomesticated Goddess and start Room. I made progress on Tribulation Point and almost completely read Convergence (had I not had plumbing issues Tuesday cutting into my reading time I would have finished it). I participated in at least one mini-challenge each day and they were fun.
Speaking of mini-challenges, this is my entry into Day 3 Pitch a Book challenge at Books from Bleh to Basically Amazing blog.
As for my favorite book during the read-a-thon I would have to say Convergence by J. D. Watts. It was easy to read (you want quick reads during read-a-thons) and really held my attention to the point I was thrilled to be able to run an errand (which meant walking across campus) with the heat index of 103 F, because I could read on Convergence on my Nook.