The iPhone has pretty much changed my world. I’m more connected than ever before. And I’ve got more information at my fingers while on the go than ever before. I’ve found some apps that are particularly beneficial to worship leaders and musicians:
Metronome – Never have to guess what 88 bpm feels like in the middle of rehearsal again.
The Bible – Put out by LifeChurch.tv. All the major translations are available. Includes a daily reading option.
Pandora – Create your own customized radio station based on your favorite artists.
JamBase – Find out local concert listings; syncs up with your map to get you to the show.
Shazam – Instantly identify any song being played anywhere.
Concert Vault – Huge database of live concerts from the 60s to present.
ProPresenter Remote – Allows you to view or control presentations made using ProPresenter.
ClaytonFaulkner.com 
No Worship Together App to instantly download tabulature for rehearsals? Ugh. I’m stickin to my Blackberry till Apple comes up with some good ideas. [rolls eyes].
planningcenteronline.com’s iphone app is reported to be excellent for scheduling musicians and services, …. Trying to figure out how to afford an iphone…