Last night I interviewed Alex Sokirynsky developer of Podcaster on the PowerPage Podcast (he joins in at around the 16:15 mark). It's an interesting listen and I encourage you to check out his excellent app before Apple decides to shut him down. Sokirynsky's Podcaster app was denied entry into the Apps Store earlier in the week, for "duplicate functionality." Functionality that is only available on the desktop version of iTunes, ironically.
Niall Kennedy notes that Sokirynsky is still distributing the app directly via a creative use of Ad Hoc distribution (via Daring Fireball):
As of yesterday afternoon Podcaster had provisioned 1130 devices for distribution across 12 different copies of the application hosted on Google Code. Each new uploaded build included up to new 100 authorized devices after the publisher received payment via PayPal. It’s stretching the Ad-Hoc distribution model a bit but the application may have collected approximately $11,000 over the weekend through suggested donations of $10 per handset. At the time of writing Apple has not pulled the application or developer certificates from their central certificate authority.