Bukkit

Version 5.0:
-Complete Rewrite
-Improved stability, compatibility and basically just everything
-Re-introduced MySQL
-Added /sortal convert command (untested)

Version 4.9:
-Lots of code cleanup
-Possible fix of Ticket #15
-Fixed Vault errors
-Added debug option (for debug purposes, of course)

Version 4.8:
-Fixed registered signs not loading
-Fixed registered signs not charching money

Version 4.7:
-Added custom data to Metrics
-Removed old code used for converting data
-Fixed NullPointerException when deleting warp
-Now using money when creating the warp
-Cancel creating a warp when not enough money
-Some code improvements
-Removed testing code

Version 4.61:
-Added Metrics: http://bit.ly/xWxDJg
-Using bukkit's built-in Logger
-Warning when Vault isn't found

Version 4.6:
-Fixed nullpointer on every block except sign
-Fixed it downloading Skillz instead of sortal (silly me!)

Version 4.4:
-Fixed Permissions problems - should be once and for all.
-Fixed not being able to break any signs without perm
-Fixed breaking of signs when no permissions
-Fixed link breaking when no perms
-Fixed registering taking arguments that don't exist
-Fixed Permissions for unregister command
-Added payment message

Version 4.4 BETA:
Fixed loads of stuff. Try it :)

Verison 4.3:
-Fixed Permissions not working
-Added Auto-Update
-Fixed MySQL

Version 4.2:
-Hopefully fixed MySQL
-Added /sortal warp [x] [y] [z] WORLDNAME
-Added /sortal unregister (permission: sortal.unregister)
-Fixed a bug where you could not have [Sortal] on the second line.

None! Please post a ticket if you find a bug.