SQLEconomy is a bukkit plugin that combines MySQL and SQLite and puts them into an economy plugin. The great thing about SQL is it's extremely organized. Each table is like a spreadsheet, keeping everything organized. If yo don't have and experience with SQL, SQLEconomy doesn't care! It will create a table for you, all on its own.
Grab the latest release, then head over to dev.bukkit.org for the instructions.
This is a copy/paste from plugin.yml:
sqleconomy.money:
description: Give access /money command
default: true
sqleconomy.money.transfer:
description: Gives access to /money transfer
default: true
sqleconomy.money.*:
description: Gives access to all SQLEconomy /money commands
children:
sqleconomy.money.give: true
sqleconomy.money.remove: true
sqleconomy.money.seeothers: true
sqleconomy.money.give:
description: Give other players money independent from yours
default: op
sqleconomy.money.remove:
description: Take money from other players
default: op
sqleconomy.money.seeothers:
description: See how much money someone else has
default: op
sqleconomy.config:
description: Configure SQLEconomy
default: op