Oh man, I didn't even list mice or keyboards, routers, super drive etc. hell I have 4 apple remote controls!
As far as have owned I have owned every iPhone except for the 3GS. I have owned every iPad. I have owned 2 15" MacBook pro, various iPods, cases etc.
I know I'll list some of my favorite accessories!
Tom Bihn 11" MBA Ristretto computer bag. Holds a lot of stuff! You can fit a MBA 11", iPhone, 500 gig external hd, and an iPad with plenty of room left for a ton of accessories. Check em out www.tombihn.com
Tom Bihn cork fabric Breve. Apparently not available anymore which is sad because it is an amazing bag! Check out some of their other cork stuff and you'll get an idea of what I mean.
Twelvesouth plug bug add on for MBA power supply. Allows you to charge your iOS device while charging your MBA!
DRO concepts iPhone 4s carbon fiber case. http://droconcepts.com/iPhone4/carbon-fiber-iphone-4-case.html