Bukkit

Town at player
town of player
town's flags
ally/neutral/enemy of town
data from town (players name and count, rank, taxes, bank, major stuff)
owner of a plot in town (and change the owner)
price of a plot in town (maybe set that price)
resident data (friends, perms...)
Nations (bank, list, king stuff, ally/neutral/enemy...)
All you can add!

The ally/neutral/enemy thing is a HUGE thing, because in Towny the war is reeeeeally stupid, like you can grief even if is not claimed by you, you can take enemies claim but the neutral can too... so it's quite bugged.