On the whole there seems to be a very eclectic mix - I've been to a couple of literary panels, a games panel, something on superhero TV shows with rozk, Paul Cornell and others, a game of "just a Minute" and some stand-up comedy about rocketry. Tomorrow looks to be more literary SF, some science, media, etc. etc. On Sunday I'm on a fanfic panel, haven't sorted what else I'll be doing yet.
The bottom line - I'm enjoying it, but I don't think I'll want to do it next year if it's a week or two before or after the Worldcon - I find that too many big cons can be pretty exhausting, also bloody expensive. I could save money by commuting instead of staying on site, it isn't that far from home, but I'll have to give that some very careful thought.
One thing I should add - the iPad is proving much better than a laptop or the little netbook for con use - it's lighter, copes with hotel WiFi better, and really works well for this sort of traveling. I've got the logitech keyboard in my room, which makes typing a LOT easier than the the on-screen keyboard; probably won't get any actual work done, but it's making it a lot easier to blog and get email done etc.