Well the title says it all...
1.Discussion about Gear Score
2.Casual vs. Hardcore
3.Badge gear
4.Clicking vs keybinding
5. Vanilla vs TBC, TBC vs. Wrath, Vanilla vs, Wrath (and soon cataclysm will be compared)
6. Any Lore Discussion (Tauren Paladins, Thrall vs Garrosh, All classes can be DKs , 10 players nuking Arthas etc.)
7. What's harder PvE or PVP
8. Most OP class
9. Other (what?)