Sorry if this seems "spam-like" but i think that some of you will genuinely be interested in this, especially as it's free promotion!
Found a radio station/newtowork called Reach Radio where you can now upload your demos and info for free and if your stuff fits in with their shows then any one (or more) off their 400 Dj's can play your tracks on air. Basically your music or whatever gets uploaded to the DJs and then they can play them during their shows.
Supposedly they get over 15,000 unique hits a month so thats a hell of a lot of good publicity for free.
Plus for just 1 english pound you can get a web advert for 2 weeks if you want a bit extra; we're not using that bit at the moment, but might later.
It's pretty new so get on there now to increase you chances of airplay.