I looked it up, as I wanted to be able to browse my tablet from my PC without connecting the USB, and found that there is Samba for Android. So far as I can see it only shares /sdcard/, but at least it gets me on.
Maybe someone can find a way to get it to share / (root directory)
Anyhow, it's here SambaFilesharing: http://forum.xda-developers.com/showpos ... tcount=128
BTW: nice feature - enables and disables on WiFi access :¬)