To Kill A Mockingbird, read by Sissy Spacek was an absolute delight - I'd read it a few times before, but listened to it ahead of seeing the play (which was also awesome).
The Bee Sting - long, so good for a long car journey!
Recently I listened to Yesteryear, and I didn't want to get out of my car, very fast paced.
Still Life as above was a beautiful read (didn't listen).
Tom Lake, as above, read by Meryl Streep was lovely, not much really happens though. Similarly her latest, Whistler.
I love Any Human Heart by William Boyd, but read it rather than listened.
I think the Stephen Fry books are supposed to be a good listen, but haven't done so myself.