I'm not sure about other guilds, but my guild <Unknown> on alliance raid multiple raids every day of the week.
We are mostly raiding 10mans at the moment, but we are trying to recruit more players to do 25mans more often.
We haven't cleared everything on heroic 25man yet, simply because we don't have enough people.
However, we already did BoT25 with Sinestra 25HC and FL25 with Rag and Rhyo 25HC with less than 25 people.
Check out our Rag HC 5man:
http://forum.warmane.com/showthread.php?t=347374
Raid progression/guild info:
http://unknown-warmane.shivtr.com/
And who might you be Andrew? What's your in-game name on Alliance?