Hi!
Found your site googling "pandora for books".

Project looks exciting and I hope that your "Readers Project" kicks off soon.
One suggestion that I don't see in your forums is to make use of Lexile scores in your ratings/search parameters.
http://lexile.com/ describes how books are rated for reading level using this system. Students across the US take an electronic test a few times a year to measure their reading level and are provided with that information to help them choose "just right" books. This is an improvement over the current age/grade level organization generally used, but there is still a need to improve finding books the suite the interests of young readers.
The particular challenge that I have right now is finding appropriate books for my 4th grade, 9 year old son, who reads in a lexile range of 850-1050 (8th grade level). Books in his age group section are too easy - he breezes through them in less than an hour. Books in young adult are generally not topics he is interested in. Lexile.com doesn't offer much in the way of narrowing its suggestions beyond genre. I'm relying mostly on word-of-mouth (which has been most successful so far.

)
It seems that Booklamp will provide the ability to find books with a similar "feel" to a known book, but I hope you can include some additional parent friendly features like lexile scores and toggles/sliders on sex/violence/language ( like
http://www.kids-in-mind.com/ ).
Thanks and looking forward to the next phase!
-lissa