Are there any good websites that can recommend books based on what i have already read?

Shelfari (discover people with similar book interests and find similar books)
Book Lamp (never tried it)

If you look up a book on Amazon that you have read they suggest other books that people order along with that book. I have used it many times to find books.

And this, with good hyper links. http://thegreatbookslist.com/

@Dog’s suggestion is a 5 star one, too.

Fluther has worked pretty well in the past for things like this, too.

if you have facebook, you can also use the iRead application. i really like that and its a good way to keep track of books i have read and rate them so i don’t forget. they also recommend books. i also have shelfari and would second mirza’s suggestion about that.

i second iRead, it’s pretty awesome. keeps track of the books i need to read, that’s probably most useful for me..

yep. I was going to say IRead and amazon, glad to see i’m not alone.

Amazon and GoodReads

Strangely, I have also gotten pointed to sites about books in areas I am interested in from Stumble Upon.

I’ve lost so many hours of my life to stumble upon!

Here is a good one:

http://www.whatshouldireadnext.com/search

Thanks for introducing me to that site, Bri_L. Thanks also to Mirza.

I too use whatshouldireadnext

Take a look at, “Stop You’re Killing Me” if you’re a mystery fan.

I use http://www.librarything.com/ (which, FYI, entails cataloging your books and—if you have more than 200—paying for your account).

I use http://librarything.com as well and really love their suggestion algorithm.