The other night I finally did something I should have done months ago, and bought a year's membership to Duotrope.com.
Duotrope is an excellent resource for writers. They post listings of every writing market known to man, and have a very user-friendly search engine to help you track down potential homes for whatever it is you're trying to publish. They used to be free, but I guess they weren't making ends meet on donations alone, so this year they instituted a membership fee. Still, all they're asking for at the moment is $50 a year. It's one of those investments, like buying a printer or paying for postage, that you should just bite the bullet over if you're serious about publishing.
I was starting to feel guilty about it anyway. So far I've sold three stories to publications I'd found through DT, and I'd never donated. It's never good to be a stingy writer. We need to support the community if we want it to support us.