You can use Srcibus for Invitations or (more intersting for publishers)
to design cover pages for books and thesis work.
I used Inkscape for my cover page since I was not familiar with Scribus.
While working on another document I learned a bit more. The PDF
generation is really good. The user interface could become a bit more
intuitive...
a page layout program. I would hestiate to use LyX to
publish the local club newsletter and would not use
A German mangazine on free software and Linux uses Latex to produce a
very nice layout:
http://www.freies-magazin.de/2007/freiesMagazin-2007-07.pdf
On the page they even share their Latex layout which looks quite
professional:
http://www.elyps.de/magazin.html
regards,
Timmie