Guild Wars 2

make a guild listing/searching tool in-game so that players would stop spamming guild advertisements in chat channels.

Get a reward for defeating an enemy with an environmental weapon.

Somehow combine hero panel with inventory panel.
Combine mail and contacts.
Remove LFG tool from contacts and make it its own thing.
Give PvE its own icon.
Be able to remove or disable some of the things on the top right corner of the screen like story info etc to free up room for new items received listing.
Shrink experience bar and move somewhere else (its unnecessarily large and takes up too much screen space). Maybe make it a part of chat window or just a thin line somewhere.