A lot of stuff from Alice in Chains/Jerry Cantrell's solo career utitilizes wah.
Frank Zappa used it quite a bit in his solos.
John Petrucci uses wah in some solos such as Lines in the Sand.
Vinnie Moore uses wah in a lot of his material. The CD Out of Nowhere has quite a few good examples, my two favorite being Thunderball and Time Traveler.
Testament used quite a bit of wah on the song Low.
A lot of Jazz/Fusion players used wah. I liked Nick Moroch and Jeff Sigman with Lenny White on Adventures of Astral Pirates, Al Di Meola used wah quite a bit with Return to Forever, there was some good funk wah on a lot of the Brecker Brothers' material.
If shred is your thing, Paul Gilbert's songs are peppered with wah. My favorite would be Down to Mexico.
If G'N'R was your thing, Slash used a bit of wah. Appetite for Destruction has some throughout.