Probably doable via some regex magic... Let's try!
If you wanted to create a collection from *every* tag except 'Fantasy':
Set 'Tags' to 'Create'
Set the 'Include' column to: ^(?!Fantasy).*
And that *should* do the trick (untested). Prepare yourself to end up with a crapload of stuff, though, it will create a collection for *every* tag you have that isn't 'Fantasy' in this example... Keep in mind that this would also be a somewhat strict match, (ie. if you had 'Fantasy - SciFi', 'Epic Fantasy' or that kind of tags, they'd end up as a collection. We'd need a more complex regex to catch those too).
EDIT: Well, actually, no, 'Fantasy - SciFi' wouldn't get through with that pattern. You could try a simple ^(?!Fantasy) but I'm not sure that'll do what it's supposed to...
Last edited by NiLuJe; 02-04-2012 at 08:14 PM.