negative margins?

I'm watching Microsoft's style sheets informercial on the Mbone right now
(hi Bert!).  They are making a big deal about being able to indicate
*negative* inter-text margins to accomplish layering of text over text for
Wired-magazine-ish effects.  Is this a, uh, recommended piece of

brian@organic.com www.apache.org hyperreal.com http://www.organic.com/JOBS