I'd love to see a cross platform variant, influenced by TextMate's design. I tried out redcar last year but it wasn't ready for primetime then. I may be confusing redcar with one of many other editors I tried out last year, I'll give it another look.

update it was redcar that I used last year, and it has improved quickly (kudos to the project team). That's a great sign. Kinda psyched to have something textmate-ish on ubuntu! The themes are pretty hot, and the bundles are chock full of languages.