The Apple iPhone 3G phone released today, along with the App Store which houses applications that leverage the new technology like the Multi-Touch interface, the accelerometer, GPS, real-time 3D graphics, and 3D positional audio. Now welcome the WordPress for iPhone.
WordPress for iPhone App will support WordPress.com blogs and WordPress.org blogs (2.5.1+) and will let you blog and edit articles on your iPhone easily. Its still not live, but coming soon. Check out this screencast.