Bukkit

I am a big fan of this plugin, and have some suggestions for its further development.

First is customized potions. With the current system, you can only used data values to create potions, which only allows you to give players the default potions(Instant Healing, Swiftness). This greatly restricts what can be done with potions; you cannot make special potions that give multiple effects(Swiftness, Strength, and Nausea combine to create a Berzerker potion) or potions that give potion effects not currently available as potions(Haste to capture points faster, or Absorption for tank classes).

My second idea is persistent effects. Besides giving a class armor, weapons, and items, you should also be able to give the class status effects that last as long as they are playing as that class.
For example, a scout class could have constant Swiftness, or a healing class could have constant regeneration and max health increase, but also a weakness effect.

I hope you can implement these ideas, as it would allow for much more control and variability between classes.