Here you go!

Four 1N5818 diodes form a bridge rectifier converting AC to DC.
Four Ni-MH AA rechargeable batteries clean and filter the rippled DC power from the diodes providing clean and safe power for USB devices connected to the USB connector. Go ahead and install 2 USB connectors, one for the PDA/Pocket PC and another one for the Bluetooth GPS receiver.
I built my own LED headlight and taillight and set them up to run on the Ni-MH batteries as well. You can't run USB devices and the LED lights at night from the batteries and dynamo. This is just too much power drain for the dynamo to keep up with.
The LED lights were setup so the dynamo is producing 120mA (at speed) of current more than used by the LED lights. This insures the batteries are recharged at the recommended slow rate to take care of stops when in traffic or hill climbing. If your riding continuously you should disengage the dynamo 15 minutes of every hour to prevent overcharging the batteries.

I use a Palm TX which has WiFi allowing e-mail and internet access at hot spots. I may also use the SD card from my camera in the Palm TX allowing upload of video and photos directly from the SD card in hot spots and I can write and upload reports on my progress.
I use Cetus software on the Palm for GPS. http://www.cetusgps.dk/
This software is free and allows maps to be displayed on the Palm. You can use maps from google and yahoo including satellite views. This software also allows you to scan paper maps with your own notations marked on the maps prior to scanning and converting them for use in the Palm. This is an extremely useful feature not available on any GPS unit.
Here is the Latest Bluetooth SiRF III GPS unit from DX. http://www.dealextreme.com/details.dx/sku.10614