Now that I finally applied some styles to challonge.com, I figured I'd start talking to myself a bit. I'll be mentioning random upcoming features here, so feel free to chime in if there's something you'd like added to the site.
Though challonge has gotten its first swipe of styling, the generated brackets are still pretty lame. I opted to make them Google maps-ish with click and drag viewing, but this may change once I finish reworking the display of the brackets.
Also in the works: team tournaments, open sign-up tournaments (currently only support invitationals), and some additional UI changes (photos?).