All features

Behold a list of stuff that... um... GE can do!

Easy commands /buy and /sell to create offers
Offers are automatically linked and players get a message when offers are completed
If offers are completed (or for example 20 out of 40 stone was bought) but an owner is offline, the items/money will be placed in a Collection Box for him
The Collection Box can hold infinite items and money
Items are NEVER lost, they are always stored safely in the Collection Box if they don't fit in someone's inventory
Players use /collect to collect the items/money they earned before
/buyoffers, /selloffers and /offers allow players to browser through their offers
Players can advertise their offers with /ad (make sure you enable advertisements in the Configuration)
With /abort it's easy to remove your last made offer or an offer seen in your offer lists
This plugin supports permissions!
Item names can be full names (lapislazuli or grass or pinelog), no need to worry about data values
Item names can also be made with the usual :
Item ids can be used instead of names
The help on GE is always available via /trade, displaying a full overview
You can configure worlds on which trading will be blocked
You can configure many toggles
Auto-saves data every 5 minutes
Full-blown infinite offers
WorldGuard region support
Change display name of shops
Shops can emit redstone

Bukkit