using grass to make high quality maps

[juxlus]

My question probably has more to do with computer graphics and output than
with grass in particular.  I'm interested in making large maps of a
professional quality -- and in using GIS-style routines like contour
shading, slope and aspect stuff, oblique viewing angles and the like -- the
kind of stuff I know many GIS's are capable of -- and am assuming grass is
also capable of (isn't it?), but my knowledge is weak at a more practical
level.  Seeing as I don't have high quality plotters at my disposal, how
would someone like me go about the printing part of all this?  Are there
printing companies that can accept a standard sort of data file or files
and produce large, high quality (and hopefully color) maps?  I know many
printing shops can accept Macintosh data from programs like Adobe
Illustrator and especially things like Quark Express.  Would I have to
transfer the map from grass into a package like this, and then go to the
printer?  Are other people doing things like this?  Any pointers?

Thanks

Paul Fly