I hope it's okay to "dust off" older threads like this.
Books:
Well,
Lord of the Rings and
Harry Potter. Those almost go without saying.

I'm impatiently drumming my fingers waiting for #5.
I second Neil Gaiman. I just finished
Neverwhere, and it is simply terrific. I also read A
merican Gods, but it's so similar in many ways to
Neverwhere that I found it hard to decide how I feel about it. It's a good book, and a fun read, but it lost a bit of its glow when I realized how similar it was to Gaiman's earlier book.
One book that really surprised me is
Rebecca's Tale by Sally Beauman, a sequel of sorts to Daphne du Maurier's classic,
Rebecca. This is leagues better than the ghastly
Mrs. de Winter, which I wouldn't use to line a catbox.

Beauman's novel is like really, really, really well-written fanfic: she has a fan's deep knowledge and appreciation of the source material, and wisely doesn't try to re-create the voice of the original novel--she finds her own voice. Not only is the story terrific as a sequel, it stands alone as a novel in its own right. Very well-worth checking out if you loved the original (which I also recommend if you haven't read it!

).
Poetry: hmm, I'm partial to Anne Sexton and Edna St. Vincent Millay.
I also devour mysteries by the crate, and am particularly fond of the Rina Lazarus/ Peter Decker series by Faye Kellerman.
That's all I can think of for now!
Firefoot