The Satechi iClooly Aluminum Stand for iPhone 3G and 3Gs lets you make your iPhone look like a mini iMac. The case holder has a pivot function allowing the iPhone 3G or 3Gs to be rotated horizontally or vertically. One push button allows for detachment from the stand.
The Korean-made iClooly is stylish and fun and has cutouts in all of the right places so it's easy to use when the iPhone is on the stand. It retails for under $30 at Amazon.