To formalise this further:
All progression raiding is officially on hold at least until the next patch hits. We'll see what happens then, but at the moment their are insufficient signups for us to form raids, so we're going to avoid further hassle for the time being.
Karazhan raids can still go ahead (maybe even Zul'aman, if the interest is shown), but nothing more in terms of Burning Crusade raid content.
In the meanwhile, however, Tingham will be setting up raids of old-world content, and running groups through the necessary attunements for them.
If people haven't done any of these old raids, I very much urge you to try them; many of them were incredibly fun, with some fantastic encounters that, to be honest, make some of the Burning Crusade ones seem a bit transparent or boring.
Zul'gurub is one of my all-time favourites, and whilst you're very unlikely to get anything useful out of the place, it's fun, and who knows, you might pick something up that looks cool *cough*Jin'rohk*cuogh*