[link|http://www.theinquirer.net/default.aspx?article=38666|The Inquirer] has a nice history of OS/2 from someone who was there in the trenches with us (at least in the Internet trenches).
There's at least one error in the timeline (Warp 4 didn't come out in November 2006), but on the whole it agrees with my recollections.
Cheers,
Scott.