Well, not a lot of people use OS/2 Warp as I write this page in 2012. However the following pages are interesting primarily in a historical context and should be taken in that context.
There are still some users of OS/2 even today. Banks and financial institutions are among the last to migrate to other platforms, in part due to regulatory issues, and in part due to the innate inertia of financial organizations.
If you have any information about who might be still using OS/2, please drop me an email and let me know. I think that would be interesting information to add to this DataBook.