I usually use lip balm -- I put some on the back of my off hand, then use it to lubricate whatever I\'m sculpting with.
Colour Shapers are good for sculpting. . . they\'re silicon paint applicators, kind of like solid rubber paintbrushes. They don\'t stick to the GS at all.
Another good option is mixing putty, as somebody else mentioned. Brown stuff is waxier than green stuff, and I find that just a little in the green gives the mix the best of both putties.
People are also recommending a new putty called ProCreate, but I haven\'t tried it yet.
Oh, and you may want to join the 1listsculpting list:
http://groups.yahoo.com/group/1listsculpting/
It\'s a helpful group with a lot of good FAQs and resources, and people who range from the guy who discovered that green stuff was good for sculpting miniatures all the way down to rank newbies.
Joel
http://minutiae-minis.com