Apple published a high quality video tour of the Apple iPhone featuring all the gory functional details of the mobile phone revolution.

The video is a great training to be ready to use the iPhone right away when you get one this Friday.

It also explains to first use one finger to type on the virtual keyboard and then later as you get more trained use two thumbs. Not sure why this is a good idea. If you are a 'Crackberry' you just should continue the two thumbs typing.
See the iPhone tour at the site.

A detail I missed before is that the iPhone will be actually available in the online Apple store. But I guess if you want to play with your iPhone on the weekend you should just visit an Apple or AT&T store, despite the potentially long lines.