Other places of interest

fandom
livejournal.com-Needs no explanation
fanfiction.net- Needs probably even less of an explanation
thefanlistings.org -Where you can find fanlistings for virtually everything
cap_it -Okay, so this is on LJ, but it's listed seperately because it's one of the most useful things ever for finding pictures
mikes-images -Another great site for screencaps
collectormania-It's cool, trust me. I go almost every year.
tvtropes -Possibly the most addictive website ever

fandom specific
doctorwhoforum -The place for Doctor Who fans to gather, chat and argue
theforce.net -The big Star Wars site (also with forums)
sagajournal-Star Wars essays (including some of mine). Just go, you may learn something. ;)
the anakin skywalker home page- Essays and fanfic and a nice message board (and more)
starwars.com- For the Star Wars fan who has everything
The offical Doctor Who site- full of interesting bits and pieces
sugarquill -a Harry Potter fanfic site
the leaky cauldron- Harry Potter news
council of elrond -For discussion of Lord of the Rings
disneysites messageboards- Where you talk about Disney

movie stuff
the movie review query engine -Useful beyond all imagining
the internet movie database -ditto
flickfilosopher -My favourite movie reviewer
rottentomatoes -Another one which needs no description
movies in fifteen minutes- Hysterically funny (and there's a book)

misc
irregular choice -sell the most awesome shoes ever.
icanhascheezburger -home of the LOLcats