I have learned (thanks to Phil Plait) about a really neat website where you can submit short stories. Others may read and rate your stories and you can of course read and rate others. The site is called Ficly, and its really well done. The neat thing is that a single story can be no more than 1024 characters long, so you really have to be economical in your story telling. You can also write prequels and sequels to your own or other's stories.
I have submitted two stories so far.
The most recent, starring everyone's favourite fundie bigot, Fred Phelps is called Fred's Day and was up for about a minute before someone read and rated it. Wee.
If you like writing at all, give it a go...