I got hammered one night and tried to jump over a fence to impress a girl. Instead of landing on my feet, i landed on my phone and shattered the screen.
The repair went well, I highly recommend having the metal spudger handy when replacing the screen. The hair dryer i borrowed from the girl i was trying to impress worked remarkably well as a heat gun.
Be careful of the glass splinters and of jumping fences when your tanked.
iPhone 3G and 3GS Front Panel Adhesive Strips
iPhone 3GS Front Panel