If you're interested in writing competitions, there's something I've become aware of recently that I haven't seen mentioned on Townhouse. It's a website called www.writeintime.co.uk and you can follow them on twitter @Write_In_Time . They have listings of all kinds of competitions, from poetry and flash fiction to full-length novels with everything in-between. Although they're UK-based, they do list US competitions as well (and possibly from other parts of the world).
On the subject of twitter, I know it understandably fills a lot of people with horror, but I'm increasingly finding it a very useful and supportive resource that nicely complements what Townhouse does. There's a great writing community out there (just use the hashtag
#writingcommunity to find them), as well as twitter pitch competitions, agents listing their likes/wants (often with the hashtag #mswl). My twitter timeline is now made up almost exclusively of writers (published and unpublished/unagented), agents, writing consultancies and publishers, and most of what's on it is very positive. So, worth a go if you're interested.