i pointed my friend towards this thread as he really likes Linux and really hates MS (heck, he had a site called windows1984.com!). Personally, i use MS and am too lazy to learn about anything else but i follow this thread with interest and not much to contribute. Here's what my friend has to say:
"did u know?
* google runs on top of ~ 100,000 linux servers  
http://www.internetnews.com/dev-news/article.php/3491026* microsoft is deploying a massive linux based wireless lan
  which will serve 25,000 employees in 60 countries:  
http://www.computerworld.com.au/index.php/id;754084996;fp;16;fpid;0* microsoft has in the past used a distributed linux
  web server network called "akamai" to protect it's web
  site against distributed denial of service attacks.  
http://www.smh.com.au/articles/2003/08/19/1061261127586.html* al jazeera tried to use akamai to protect its web presence, but,
  since it hates freedom too much, its contract was cancelled.  
http://news.com.com/1200-1035-995546.html* hotmail was built on solaris (UNIX) and continued to run solaris
  for several years after it was acquired by MS.  
http://en.wikipedia.org/wiki/Hotmail* the mac OS X safari web browser is built on the open source
  khtml redering engine, with improvements flowing in both
  directions:  
http://www.apple.com/macosx/features/safari/* the mac OS X kernel ("darwin") - which is the core of the
  operating system was derived in part from opensource
  freebsd ( which allows re-use of its code, in closed products ).
  apple now supports a parallel "opendarwin" Mac OS project,
  with improvements flowing between darwin and opendarwin.
* sun solaris is now opensource software:  
http://www.sun.com/software/solaris/  http://www.opensolaris.com* linksys and cisco wireless routers have in the past,
  allegedly used linux inside their devices - violating
  the copyrights of the owners.  
http://lwn.net/Articles/51570/* venezuela is moving all-of-its-goverment off microsoft
  and onto open source. note that the headline warns
  "but faces challenges" - this is referring to challenges
  from microsoft.  
http://www.venezuelanalysis.com/news.php?newsno=1439  ( there are many examples of non-US countries around
    the world ditching MS )
* opera web-browser is built on top of QT opensource
  graphics library, which is why it works on so many different
  platforms (windows, mac, etc), including mobile phones
  ( with qtopia )  
http://www.overclockersclub.com/?read=2066112* many opensource companies and projects make money,
  in some cases, millions of dollars - mysql, trolltech, redhat.
  MSFT vs RHAT  
http://finance.yahoo.com/q/bc?s=MSFT&t=5y&l=off&z=m&q=l&c=RHAT* individuals and small companies, especially, stand to make
  a lot of money out of this stuff.
  eg. US opensource developers sell support and training
  for their project.  
http://www.etherealsoft.com/  eg. italian company NXmachine.com opensourced the core components
  of its remote desktop software, but continues as a commercial entity 
by
  providing support and closed-source server side NX software.  
http://www.nomachine.com/index.php  eg. australian IT company has at least 30 employees, and provides 
open
  source content management solutions - they make money from support,
  and development of special closed-source add-ons for customers.  
http://www.squiz.net#
but this stuff is mostly "under the radar", meanwhile, the
microsoft "shock and awe" campaign rages on around us.
just hold tight.
ps. i'll send you the next ubuntu live CD when it is released
in april, so you can see where the linux desktop is up to,
you can run it, even save files and install software, without
disturbing your installed windows OS or hard drive."
hehe. the last part obviously relates to my fear of trying anything different  for fear of 'screwing it up'. took quite a bit of convincing for me just to try firefox!