I know there are many podcasts and online radio stations and if the producer accepts advertising, it provides an opportunity for businesses to advertise. I have seen display ads on Pandora on my Ipod Touch and one PSA on my broadcast. Would you advertise on Pandora or use Targetspot? What do you think?

I think media ads is also a good ways to promote your business...

Some radio station provide frequencies better for the regional coverage and might be good if you're targeting to specific region., I think you should also try out giving ads on local cable especially if you're targeting local market.