Howdy.
As I'm new here, I figured I may as well share what I mainly use Lego for.
I don't often build MOCS, viginettes, dioramas or anything like that.
I'm a Brickfilmer. I use my Lego to make short stop motion movies. I only have a couple finished so far but I have about 6 more planned out start to finish.
If you're interested, this is my youtube channel: http://www.youtube.com/user/SpiderSock. When I finish my website, www.brickheadproductions.com, I'll host the films on there, too.
My first brickfilm was Assassin, which can be found here.
I was mainly experimenting with set and prop design as well as getting used to using my webcam so close to the "action".My second film was As Unlikely Hero, which I made as an entry for the Nicktoons "Built By Me" brickfilming contest. It didn't get any prizes, however. You can see it here:
So, enjoy. :)