iPhone 2.0 is here, and for those not willing to wait for the built in software update, you can download the firmware from this link. Make sure you have iTunes 7.7 (readily available via software update).
Make sure you have fully syncd your iPhone before you upgrade. After you download you can select the firmware file manually by holding the [OPTION] key and pressing Update button. This will let you select the .ipsw file. (UPDATE: rename the file from .zip to .ipsw, no need to uncompress it)
Don’t use this for iPod touch, only iPhone. Windows users hold [SHIFT] key when pressing update. Leave a comment and let me know what you think of 2.0.
Use at your own risk. Your milage may vary. Results are not always typical. Don’t shoot the messenger.