Fixed IPhone battery, in 30 minutes, solves multi-month grumpy family
Iphone 3G wouldn't hold a charge after 3 years of abuse, which meant it didn't really work well as a mobile.
Repair was flawless. It took about thirty minutes.
Be very careful, however, when parting the screen from its housing -- those ribbon cables are delicate flowers. The small suction cup really helped, surprisingly, to separate the screen with a controlled amount of force (if you don't have a small suction cup before you start your repair my advice is to go find one)
iPhone 3G Replacement Battery
Phillips #00 Screwdriver
SIM Card Eject Tool