Bukkit

v5.6
Added MySQL
Added loads of stuff
Improved speed a lot, buffering data instead of writing it every time (do mind, if server gets killed progress in the last 20 min MAX is lost.)
Some other things I can't remember.

v5.51
Fixed error on first startup
Added Metrics System
Possibly fixed Bug #8 (Citizens bug)

v5.5
Updating fixed.
Added per-amount-of-levels and fixed-levels for all skills
Don't give money when it's 0
Updated API
Added an XP Remaining bar
Fixed some small things.

v5.4
Fixed DC on levelup with item-reward set to 0,0
No longer need settings.yml everything is in skils.yml
Fixed Auto-updating
Converted to Maven for compatibility with Jenkins
Fixed reset of Skills file in non-PVP with arrow on top of someone
No longer get XP when falling, but not getting damage
Fixed acrobatics setting the damage to the damage that should be avoided.

v5.3
Fixed Mining, Digging and Woodcutting
Did major refractor on all skills, makes it easier for me to track down bugs.

v5.1
Fixed some API stuff
Added Auto-Update
Settings with enabled skills are now working.

v5.0.1
Fixed MySQL not working (at all.)

v5.0
Added API and GitHub SkillzAPITest Plugin

v4.5
Fixed Settings not getting created sometimes
Fixed typo (omg)
Made a start on API

v4.4
Finally fixed HighScores not saving properly.

Flatfile doesn't work, because there's a typo. This is fixed in #217
Didn't have time to add Farming yet, so that doesn't work.