I took Jerry's post as a little light humor.
I use the Navionics charts on the iPhone to supplement the chartplotter and paper charts. In many instances I get better info from this app than the chartplotter. The iPhone 4's locks fast and updates well. It saved us from an edge of Folger Rock while racing in Barkley Sound last summer. Very useful app.
Then there's Ayetides. HamLog. Mobile Mouse. Remote.
Good integration with several desktop apps. The package works for me.
Nice to see Android and others coming along.