From the press footage and trailers so far, Skyrim looks to be pretty graphics intensive, and I'm worried my computer won't be able to handle it.
Have the official system requirements been released yet? If so, what are they?
Finally Bethesda has released the official requirements: http://www.bethblog.com/index.php/2011/10/25/skyrim-system-requirements-announced/
Supposedly the system requirements will be released in October, however, there are a number of sites that have guessed at what they will be. This may give you a starting point.
Recommended System Requirements
Supported Graphics Cards: