This looks like something at least worth checking out – ReverbNation just released the beta version of an iPhone app that will allow you to collect fan mailing list signups, manage all your different status updates, send email newsletter updates and more, all from the comfort of your iPhone.
And the best part is that it’s free.
The downside – you have to sign up to Reverbnation and use their service to manage all your data.
It will be interesting to see what functionality future versions of the app will add though. Some I thought of would be Credit card/Debit card transaction processing, SMS group signups and group text-messaging, location-based targeting of fan messaging, and merch inventory management.