Extend the battery life on your iPhone
Thank you Apple for these tips. I find them very useful now that I own an iPhone.
Optimize Your Settings
Depending on how they are configured, a few features may decrease your iPhone battery life. For example, the frequency with which you retrieve email and the number of email accounts you auto-check can both affect battery life. The tips below apply to an iPhone running iPhone 2.0 or later software and may help extend your battery life.
Top 10 iPhone Applications
Apple may not have yet opened the iPhone and iPod Touch for full application development, but that doesn’t mean that there aren’t plenty of great Web-based applications out there.