Bukkit

3.7
Urgent fix for a bug. Upgrade immediately.
Compatibility with helper plugins improved.

3.6
Fixed versioning information
The 3.5 download thinks its 3.4 so we'll let it believe that.

3.5
Fixed chat duplication bug

3.4
Improved compatibility
Bug fixes for commands, paths, etc
Metrics system for install tracking

3.3
1.1-R6 compatibility