What's going to get really interesting is seeing where Apple draw the line with "subscription apps".
The Rhapsody and Magazine apps of this world seem fairly clear cut. Kindle is somewhat less so (since books aren't a subscription service - something most blogs seem to miss). But what about these "Go to my PC", Salesforce.com, or other SaaS sites that basically provide free iOS apps for expensive subscription plans? Are these companies now all going to start adding in-app sign-up options and paying Apple a cut?