By plugging your URL into Open Site Explorer you will be able to see a few stats about your links. The real valuable information is under "Inbound Links". Here you can see exactly what websites are linking to you. For bonus points try plugging in one of your competitors URLs and see who's linking to them. Chances are they have links from a directory or blog that you could also get a link from! There's nothing wrong with a little bit of sneaky online espionage!