If you haven't already noticed, we now allow users to log in with Facebook. This lowers the registration barrier for Challonge! itself and tournaments that use our sign-up feature. We're currently just using Facebook for authentication, but if we add additional features for their API, we'll allow existing Challonge! users to connect their Facebook accounts.
Also related to tournament sign-ups, you can now require users to sign up for your tournaments with Challonge! accounts. Previously, there was no way to disable the "lame" name-only sign-up option.
I'll keep development promises to myself for now, but there's some good stuff in the works for early 2011. Stay tuned!