Oh, snap! Iron Maiden’s site has a Flash game where you get your gun on as the ever angry Eddie the Head. Not super great, but hey it’s got the soundtrack to make you bust out the leather pants and the spike bracelets.
I’m feeling researchish today, so here’s Wikipedia’s article on Eddie the Head, as well as the portfolio of Derek Riggs, who created Eddie for the band. (If you want to just browse Rigg’s Eddie work, click here)