Ok I fired up 685 with OS X and filed the following bugs on it already, all or some of which might be JDK specific. If they are I noted to IntelliJ to let me know so I can file them with Apple:
1- When the IDE starts up, you get no menus drawn, just a splash screen. Upon clicking in the menu area, the menus are drawn, but the splash screen stays in the background and never goes away.
2- Typing lots of chars on one line can be hazardous to your sanity... the more chars on the line the further back the caret will be. By about 161 chars, the carret is about 2 spaces behind... this depends on the font. In HTML it's actually 4-5 spaces AHEAD!
3- Command keys still don't work and display as meta. I couldn't remember if this was a JDK issue or not either.
On the BRIGHT side, the jar files don't take forever to load anymore, but it's not as fast as on Win or Linux, the new project window doesn't go insane, and the anti aliasing seems to be holding up throughout the IDE.