Most needed class for raiding?

[Ackley]

Hey all, I'm just looking for information on what classes/specs seem to be needed amongst active raid groups. I have the most experience playing a Rogue and a Shadow Priest on retail, but since the former is likely overpopulated and the latter is all but useless in vanilla, I assume I'll need to change it up (but hey, it's probably time I learn something new anyhow).

Any info from players/guilds in need would be very helpful! Thanks ahead!

[sgtnanners]

Resto shaman and warlocks

[Imbaslap]

dwarf

[Jeddite]

Replace all useless Rogues with Hunters for permanent Tranq Shots on all raid bosses. You only need a Rogue if your raid absolutely cannot clear to Broodlord without disarming suppression traps.

[Adwena]

Dwarf priest master class