Portal 2 for sure lol, When Notch released 1.5 he was 'afk' from twister for a good while before posting again. So if their are any bugs/glitches in 1.5 that is stopping Bukkit they have to wait until Notch fixes them until they can move forward or find a way around the bugs and glitches which takes even longer. Everyone is saying blah blah how it only took Bukkit a few hours to get it up an running after 1.4 came out. Not all updates are the same, and every update changes the game differently. The 1.4 update did not having anything that broke Bukkit to a point where it took them hours or days to fix. So its safe to assume this update has broke a lot of Bukkit code that needs to be fixed. 1.5 has brought a ton of changes to the game. Just sit back and wait it will come.