There's actually a pretty good Universal section of these forums (actually the reason I joined). I don't know how to link to it on this, but you can find it if you click the "Forums" tab at the top.
I, personally, LOVE Universal, and think it's worth the trip. Some quick tips off the top of my head:
I definitely agree that a 2 park pass (Universal Studios and Islands of Adventure) is your best bet, especially if you're not going with small children. IOA is great for thrill rides and coasters, and US has a lot of rides plus a bunch of really great shows/attractions. It's very easy to go from one park to another, and while, if you're only there one day, you'll probably want to structure your trip a bit, you could easily go back and forth between the two.
Check out the lines when you get there and see if a fast pass is worth it. I've actually gone once where, for a few rides, the wait time was actually LONGER for the fast pass holders! That was an off season March trip a few years ago.
Universal has a bunch of free shuttles that pick up from almost all local hotels and a few other places, definitely should look into that. A taxi from i-drive will run you approx $10 each way if you decide to do that.
As with any other park, get there early and hit the major attractions as soon as you can. I know the Harry Potter area often opens earlier than the rest of the park.
The Univeral forums here will give you lots more info!
Best Wishes, and Enjoy!