Avalon Hill's PanzerBlitz was a successor to a game called "Tactical Game 3," which was never developed for market. The story can be found on related web sites. What's important here is that the game does have a long and successful history, ultimately selling hundreds of thousands of copies.
Here are a few of the best links about PanzerBlitz available on the web.
Imaginative Strategist, often referred to as "ImStrat" has an incredible collection of articles, counters, maps and other material related to PanzerBlitz, Panzer Leader and the Arab Israeli games. Seriously, ImStrat is worth hours of time.
Greg's PanzerBlitz Site is another outstanding resource, also worth hours of reading.
ConSim World Forum appears to be where a number of current PanzerBlitz players can be found. The forum is relatively relaxed and low traffic, but there is a lot of information available.
There are several more outstanding links which will be added in the future, and if you, the reader, find one of your favorite sites missing, please issue a pull request with the relevant addition.