In the online fundraising world, "great promise" means donations.
In the 1st week after we launched the mobile verison of http://hope.cupidsundierun.com, 60 donations came through from Iphones, Ipads, or Android devices.
Most orgs don't see 60 donations from mobile users in an entire year.
Phones are an ideal platform for Pledge or Peer to Peer Fundraising. Making it easy for your constituents to raise money for you on the phone should be a top priority at all organizations that depend on public support.