First of all great software! This will probably keep many people loyal to SE - they should be paying you FJ !
I'm new to Vista and new to this software (just downloaded it last night so I'm trying it out) and synching to my old but trusty t68i via Bluetooth, this works great but I had a bit of a headache along the way. My Windows Contacts are split into many sub-folders (I like to keep things as organised as possible) and I couldn't get any contacts to be downloaded to the phone until I realised that it was because I had them all in sub-folders, I had to move the contacts I wanted on the phone to my top-level Contacts folder. Is this the way you wanted it to work? I'm sure you get plenty of feature requests but would it be fairly easy to somehow include sub-folders for syncing?
The Windows Calendar sync works great and allows each Calendar to be 'checked' for syncing, something similar for Contact sub-folders at the top-level would be perfect.
Best Regards