Flight Simulator 2004 add-on creators have their work cut out for them. With thousands of incredible and free mods available for download, commercial products have to be truly special to stand out and justify their expense--and Shockwave Productions has really delivered this with Wings of Power. Wings of Power may just seem like a plane add-on for Flight Simulator 2004, but it's definitely commercial-quality software: It lets you experience the closest thing to actually flying a colorful collection of World War II-era aircraft.