Looking for an ultra-light slim fitting case for the iPhone 3G? Incipio Tech has a leather case called "Feather" that might fit the bill. It comes in many great colors and sells for $19.99. Here is more info about the Incipio Feather case for the iPhone 3G:
Measuring less than 1mm thin, Feather is ideal for the iPhone user seeking inconspicuous, first-class protection. Feather is made of an ultra light, ultra strong polymer for light as a feather, form-fitting durable protection without the added bulk. Feather features a soft touch matte finish and includes 2 surface protectors and a cleaning cloth. Feather by Incipio is so thin that it allows the iPhone to be used with many of the docks on the market and adds nothing for minimal front pocket management.
- Ultra light, ultra strong polymer. - Less than 1mm thin! - Superior protection without adding bulk. - Soft touch matte finish. - Light as a feather. - Super snug fit. - 2 free surface protectors and cleaning cloth.