anything what makes playing the game more comfortable
some ideas of supporter only bonus functions:
* have possibility to switch minimap to "gathering source radar"
* storage spaces (backpacks, bank, vault) wider & taller by one square
* one more place on spell bar
* account bound instead of char bound looted items
* more auctions opened and running at the same time (when AH will be intoduced), maybe possibility of selling sets instead on single items
* pet could auto pick up loot bags
* andvanced inspect skill - mobs and players, with 3d look and basic stats overview
* possibility to make & store own notes on map or permanent land marks (visible only by the your account chars)
* access to special F6 world chat room "msg" where previous yellow messages would be stored together with timestamp