Lots of info for short story writers, including competitions although these are listed alphabetically rather than by closing date. Also carries a list of magazines that accept short stories from Granta to People's Friend and everything inbetween.
A calendar of writing competitions, listed monthly. The info comes from Sally Quilford who has lots of writing advice on her author site .
Site run about winning competitions - all comps, not just writing ones - but it has a list of writing competitions with the author's quirky comments.
Listings of jobs, courses, information and writing competitions. You can sign up for the fortnightly newsletter so the information comes to you.
The National Association of Writers Groups run a useful site which includes competition listings.
If you're thinking about writing for the women's magazine market this is a great resource.
You'll also find listings in the writing magazines such as Mslexia, Writer's News and Writing Magazine, Writers Forum and The New Writer. The New Writer sends out a monthly e-newsletter with competition info to subscribers.
If you're interested in a competition you can often find the previous year's winning entries on line which is useful.