Tuesday was our first step into Heroic Modes with ICC10, three down so far!
I think Icecrown Citadel, at least on Heroic, presents an interesting challenge for Raid Leaders. With the ability to toggle Heroic on and off, you have to make your own plan of attack such as who to focus on first.
During our first week, we took out the first three bosses with relative ease but then the fourth, Saurfang, is a whole other ballgame. We ended up skipping him (killing him on normal mode) for this week so we could try other bosses on our way to Lich King such as Blood Queen and Dreamwalker.