Check wikipedia for more accurate history:
http://en.wikipedia.org/wiki/OS/2
In my opinion, OS/2 is a more stable and reliable operating system than Windows XP/2000 or even NT4.0/3.51.
OS/2 will run even with traps, memory leaks, etc. and has 100% uptime and is object orientated presentation manager (~progman.exe)
There is alot of support for the operating system which is why there is currently a petition open to ask IBM a favor to work out the MS/IBM/3rd Party licensing issues to make it public domain. Currently, EcomStation is a more uptodate licensee of the software and their version is more affordable than IBM's version. IBM plans to discontinue sales of Warp 4.51 by this December. EcomStation maintaines that they will continue to offer it as long as it is in demand.
Being a user of Linux and Windows, you may find OS/2 to your liking. There is Win32 support via Odin and Win16 support natively (OS/2 and Warp 3.0 Blue Spine and Warp 4.0 and above) and there are two popular libraries for Linux/X windows API native compatibility. However the Odin libraries is still in development so not all win32 software will work on OS/2.
A historical note is that the JSF file system now popular with linux was originally designed for the OS/400 then OS/2 and IBM released it open source for linux, etc.
Overall, OS/2 is a very conservative/modest operating system when it comes to resources. It is real good at cleaning it self up and keeping swap file small and memory management to par. It can operate in a very tight system, ie 4mb of system memory and 80mb HD (warp 4.0) or 20mb (OS/2 2.x)
You will find alot of software for OS/2 at Hobbes:
Some other hard to find software you may find elseware, however Hobbes has maintaned to be a central location for hosting OS/2 and Win/OS2 software and multimedia files:
http://hobbes.nmsu.edu/
Regards,
Jason Page
My sigma Foveon photos:
www.pbase.com/jasonpage
Sigma community:
www.pbase.com/sigmasd9