Hi keith,
The eye fi card is sold with a configuration software called "trimpix pro software". This software had been recently updated to fit with the new OS version of the geo6000.
Just purchase from ot trimble reseller the card and you will have the configuration software.
It works fine and without a specific software, terrasync, arcpad whatever. It is a hardware config not a software ones.
Just plug the card and the device to a laptop and use the software to set an adhoc wifi configuration between both devices. The soft will probably ask you to register and install trimpix pro on the handheld.
Reboot the handheld and put the card in the slot of the camera.
For the first time, launch the trimpix pro software to check the connection and take a picture with the camera. You will see the photo being trsnfered to the handheld.
In arcpad, if you have a feature classe with a text field, simply go to the attributes forms. Click on the image tab and on the open icon and select the picture.
If it does not work, maybe your camera is not certified with this card (see eye fi website for more info). Or you do not have the last release of configuration software for os 6.5.
It works great for me since the firt release of this soft and card.
Hope that helps