What about the app Jerry suggested, Wifi File Manager?
I don't know about the syncing thing but this app that Jerry suggested seems to work well for me. After installing you start the app...it gives you the Wifi address to type into your browser and BANG...the directories and files on your phone are presented in your browser. You can open the folders to view files, you can upload data from your PC to your selected folder....
I'm a happy camper with this.
Also my windows 7 system automatically downloaded the newest Samsung drivers when I connected the phone and I can copy and paste files using my USB connection. The only thing I noticed with this method is that the file explorer will recognize the phone as an external device instead of a drive, but you can still open the contents of the device to copy files into a phone folder. Using Windows 7 file explorer, I need to select the files to copy and then drop them onto the unopened destination folder. If I open the destination folder in file explorer the copy doesn't seem to work.... Not much of a problem but something I used to be able to do with a phone with SD card and running Android 2.2
With Wifi File Manager...none of this is even necessary....just install the app, use it, and it's done.
Seems like it is a Samsung Kies alternative that works well. Never used Kies so this app might even be better!
Thanks Jerry!