If it isn't already clear, 1.5 came out, and as with every update, we're vanilla for a while. Check out the feature list here. There's a bunch of cool features in 1.5, though a bunch of bugs too.

Bukkit is saying they're having some issues with compatibility, read about that here.

Finally, veterans, just know that because Noobs was the default group, noobspawn is now the default spawn. If you die, you'll be going to noobspawn. I think this is a good thing, seeing as we've had a FLOOD of new members and have less tools to control them in case they're griefers.