Even though I'm a code dummy (unlike Robo) I'm happy to see the Bukkit devs getting some recognition (and hopefully some decent pay now they're a part of Mojang). That we put off moving to new worlds until they'd finished their secret voodoo speaks volumes.
That said, I really don't understand what Bukkit is other than allowing us to /tl and /tp.
Maybe, if you get in a mood, Brad, you could give us the tl;dr version of what Bukkit does and why it's such a big deal?