Colorado's Pikes Peak Library District has an extensive list of writing contests posted on its site.
For example, it's again time to submit humor essays to the Erma Bombeck Writing Competition. The deadline is February 17, 2008. No entry fee!
Highlights for Children is also having a short story contest for futuristic stories. Entries can be up to 800 words and must be postmarked between January 1 - January 31st. No entry fee.