http://yabookscentral.blogspot.com/ They haven't got much Science Fiction and most of the reviews are very short. Here's the link to all the Sci-Fi reviews- http://yabookscentral.blogspot.com/search?q=science+fiction UGLIES by Scott Westerfield is in my stack to be read and reviewed and posted both here and at Enduring Romance.
FROM THE EMPIRE - Trinity Blood - Rage Against the Moon series by Sunao Yoshida
http://yabookscentral.blogspot.com/2006/11/review-trinity-blood-rage-against.html I guess this is manga, which I've just gotten interested in.
HITCHHIKER'S GUIDE TO THE GALAXY by Douglas Adams
http://yabookscentral.blogspot.com/2008/09/review-hitchhikers-guide-to-galaxy.html This one doesn't show up on the Science Fiction search there, which makes me think there might be other mislabeled Sci-Fi there too. Such is life in YA Sci-Fi! Anyway, this one's on my review stack too. With all the 'dark & gritty' out there, I can't wait to read a 'fun & adventurous' story for a change.