Conan Short Stories (I don't have the complete collection, so instead of re-reading, I should really buy another book)
Elric Saga (I have never read the other Eternal Champion series, I should really buy another book)
Lord of the Rings
Not in a while, but I use to re-read Chronicles of Amber every 3 years or so, along with Myth Adventures, Thieves' World, and the Vlad Taltos series.
I just happen to be re-reading my Conan Book, and when I finish I have decided to either get the next in the series or to jump to one of Moorcock's series I have never read.