I just added "Kiss, Kiss, Bang, Bang" to my original list.
In most ways, this isn't really a gay-themed film, but Val Kilmer does play a gay private investigator, and it's heartening to see his character's sexuality being handled as a non-issue.
It's a comedy-mystery, and I liked it quite a lot. Robert Downey, Jr. gives a wondeful performance; it was the first time I saw how attractive he can be.
Recommended.