I found this website EXTREMELY helpful:
http://www.orlandoinformer.com
He (Dan) has a whole bunch of articles about US/IOA and lots of tips on how to navigate Harry Potter. e.g.:
http://www.orlandoinformer.com/2011/03/09/harry-potter-forbidden-journey-book-1/#axzz1KwH1icU6
He is actually very much like a free Tourguidemike (I'm using TGM for the first time this year). Similar to how TGM worked for WDW, Dan worked for Universal in their Vacation Package department so he has a lot of "insider" info.
He also personally answered some questions I had and helped me alot.
I also recommend checking out the thread stickied here - "Harry Potter Crowd Report". That has been very helpful as I plan our upcoming trip.
Between the two, I feel pretty good about my upcoming trip to US/IOA!