Middle left: Qualcomm MSM7500 - Main processor, EVDO Rev. A capable
Middle Bottom: Qualcomm PM7500 - Handles I/O, keyboard, backlights, power regulation, etc...
Top Left: This chip, the RFR6500, sole purpose seems to be to better handle CDMA signals for better signal with lower battery life and smaller form factors. It seems to also support off-network GPS. Wording is vague though. The closest literature I found was for a RFR6125 and since Qualcomm generally uses the same family name for the same chips, I'm going with the 6500 being a slightly improved version of the 6125 which supported -152db GPS signals.
Bottom Left: RFT6150 - This seems to be a helper chip for the RFR6500 and, according to Qualcomm, actually handles the GPS signal. The AWT6137 and 6138 are power amplifiers. I can't find good info on the other two chips.
