A note on complaining about the updates breaking the server mods and stuff. Notch CANNOT work with the people that make it. What they're doing at the moment is technically illegal as they're hacking, modifying and redistributing code that he created and is selling. Should he work with them he'd be effectively saying (in the eyes of the law) that it's ok for people to pirate his game. Notch cannot support mods in anyway right now.
Once there's an addon API (which isn't a small task, it could be a massive undertaking as the game wasn't originally made with one in mind) then maybe he'll work with them a bit, and updates should be more stable at that point so there'll be less issues.