I know I'm a little late but I'm a huge Tron fan (I'm told I saw it in the theater but since I was only 3 I don't really remember, wore out the VHS, bought the DVD first day, and then the 20th anniversary remastered DVD first day, played Tron 2.0 PC game to the end, have been waiting for this movie for 20 years...).
And for those that scratch their heads when they see the movie:
Encom = IBM
MCP = Skynet / every other evil AI that outgrew it's puny human creators
Programmers = God, the programs in the system think of humans as gods because humans created them
This is one sequel I won't be missing. From what I know so far, the only thing that sucks is that Flynn's son gets into the computer world by crawling into the back of an arcade machine (WTF?

).
Tron links:
Nobody is a bigger fan than
TronguyOne of the official Tron Legacy sites
http://www.flynnlives.com/Great fan site
http://www.tron-sector.com/