The Nikon system is NOT a gimmick, and the freedom to use the pop-up to fire a remote Nikon flash is one of the best features of "the Nikon way". It makes for a very portable, very lightweight one to two light system.
Here ya go - some shots I took with a D80 pop-up firing a remote SB800:
and here's a couple with the D80 pup-up firing two remote SB800's
Extremely portable and lightweight. A real pleasure to use!
Having said all of that, you can do the same thing with a a Canon flash in the hotshoe firing another Canon flash remotely. It's just not as light a setup as the D80 + Sb800. I could fit the Nikon rig in my smallest camera bag and have a two light setup anywhere. With the Canon rig I have to pack my two 550ex's in addition to the body.
I would love for Canon to step up and put the technology into a body!













