I occasionally do book reviews for other authors. My preferred genres are Young Adult and Romance, but I'll read just about anything. I think that I tend to be a very lenient reviewer, that's probably because I have hardly read a book that I didn't like.
I use a Nook Color for most of my eBook reading, but I can also access Kindle and Smashwords through my iPhone. If you are interested in having a review done by me just send an email at firstname.lastname@example.org.
I can't guarantee how fast I can post them. It just depends on how much I have going on in my little world.
I post reviews to Kindle/Amazon, Barnes and Noble/Nook, and Goodreads.