As I couldn't get to GenCon, I had to do something of my evenings and week end. Now, as a weekly session, I run Castle Whiterock with 4E. We've been through #51.5 In 3 sessions of about 3-4 hours (but they spent much time in the town in the begining).
Of course, I didn't play the module as is, I never do that, I love to improvise things on the fly to challenge my players. And I don't want to convert monsters, so I try to get monsters in the MM that can be as close as possible to the original ones. For the Sih'hel, I chose to base them on the Gnome Skulk, removing the Fade Away and the Shadow Skulk, but adding dazed on top of the 1d6 when they have combat advantage (for the Chill Touch feat)
Using the layout of the room, they used very well their combat advantage putting down several times the members of the group, killing the fighter (being between 4 of them doesn't help and 41 pt of damage hurt a lot
). and the Cleric (but with the help of one of her fellow party member that hoped that he would miss her in the area of effect
All in all, the characters are having fun, Lady Chauntessa is now someone they go to, when they are lookign for some contacts, they have met Quintus (whose apprentice will soon be missing, having been kidnapped by some slavers) and a strange and greedy gnome (that sent them against the Sinister Secret of Castle Whiterock).
I'm too lazy to actually write a writeup of the sessions, but I'll probably post here some of my adaptations for 4E. And of course, I'll answer every questions