
I highly recommend Brandon Sanderson's Mistborn Trilogy (yes, he's the guy who's finishing WoT for us). The first book is especially good imo.
Magic of Xanth by Piers Anthony is also a good one, for the first 8 or 9 books at least.
I have a love/hate relationship with George R. R. Martin's Song of Ice and Fire. He drives me freakin' nuts but I'm too into it to not read future books (assuming the 5th one ever actually gets released

I'll post more as I think of them.