Rate my startup idea "Be Caller Nine"
dksf: It seems like this is 1 feature which might be interesting to bloggers/podcasters.  Is there a more generalized "podcaster sweepstakes platform" you could build?  Help bloggers/podcasters engage their audiences more around giveaways/sweepstakes to generate buzz and attention, track brand impressions/dollars, present network of advertisers, etc...  I'm not a big blogger or podcaster so I wouldn't likely be the best person to design this product to solve my problems.  But reach out to real users/partners/potential customers.  They'll likely tell you what to build.