Year by Year Differences
My good friend and fellow "Hummer aficionado" Josh Ingram has compiled a detailed list of the differences in the Hummer / H1 models over the years. This list is published, and occasionally updated, by our friends on the Hummer Network site.
The list of Hummer differences can be accessed directly here.
Another excellent link can be found here.
All links provided with permission of the authors and web masters.