Here's a neat little e-toy I learned about awhile back from BookCrossing: a "map" of authors which aligns authors you like with others, the theory being that, if you like the one, you will like the others that are closest in proximity. Try it ~ I'm not sure how accurate it is, but it's really fun!
Other information about the website:
the literature-map is a part of gnooks (check this out too!)
gnooks is apart of gnod (books, movies, music!)
gnod is a projectof marek gibney