The folks at ThemeForest have followed up on their word from a month ago and purged outdated WordPress themes from their directory listings. The purge effected only those themes WordPress 2.7 or below.
As Mark Brodhuber put it on the ThemeForest forums:
Hello everyone, the purge for any outstanding themes supporting 2.7 or below has gone into effect. If one of your themes has been disabled, you can bring it back to the library by providing an update to it once you’ve made sure it works without error in WordPress 3.0.
So rest assured that the themes you’re downloading from ThemeForest are a bit more up to date today then they were a month ago. Shop happy.
And it didn’t even take Ben Linus and a gas mask to make it happen. As far as we know.