We've also been working on various Naxxramas raiding achievements, which is pretty much what we'll be doing until Ulduar is released. This week we picked up the achievements for Just Can't Get Enough, The Hundred Club, They Would All Go Down Together, and Arachnophobia.
Unfortunately we missed our Patchwerk achievement by exactly one second because I was stupid and used a Spirit Beast instead of a real pet. Also my spec was bad. Also Modrack sucks. Anyway, so far the achievement system has been really fun and the expansion gets an A+ overall from me.
We killed these guys last week. Malygos is really fun, the other two were very easy but that was to be expected. We'll be trying Sartharion with additional drakes at some point.