Sick of your iPhone's puny lens? Then it's time for a (somewhat unwieldy) upgrade.
This "iPhone DSLR prototype" is a 1.1lb, solid piece of anodized billet aluminum (that looks to be a modified Owle). It will fit an iPhone 3G, 3GS or 4 along with a complementing, full-size Canon EF lens. And since Canon converter mounts are widely available for most lens brands, I'm guessing this rig could fit pretty much any lens you tossed at it with some tweaking.