I've tested the Tab with gloves - the screen doesn't react at all
Then I tried with my finger encapsulated in one of my socks - works
When the socks became two (finger inside sock inside sock) - screen was unreliable.
Three socks - no reaction.

So you better use one sock in winter instead of gloves

BTW I finally could transmit my face from the N900 to the Tab, but not vice versa, and it was quite unreliable, but it's a start, isn't it? The key was using pbxes.org as everyone who rtfm already knew