The new T-Mobile G1 uses SD Card to expand its memory. I found that Amazon is selling the G1 Accessory compatible with the T-Mobile G1. It includes the SD Adapter needed to read the SDHC card in the computer. It’s $21.48 for 8GB for the G1.
One of the best Bluetooth headsets for the T-Mobile G1 Phone. The compability is assured by the G1 community. Grab this nice G1 Accessory at Amazon with a really good price, check it out.