I did a review of the aftermarket items available for the Italeri HMMWVs: http://www.armorama.com/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=148
There's also another article in there that is about the Italeri-based HMMWV kits on the market. The Avenger has been around for a while. It took part in Desert Storm and currently you can see them stationed around parts of Washington, DC protecting vital government facilities from aerial attack like the ones on Sept. 11th.