If you're a sucker for technical drawings, then feast your eyes on the CAD drawing / iPhone 4 photo mashups recently published on Core77.
Hipstomp (AKA Rain Noe) found out that Apple had released the CAD drawings of the iPhone 4 exterior with special annotations for case manufacturers, and he promptly overlaid the technical drawings on top of the actual product photos. The result, as you can see in the photo above, is pure artistry. There are more drawings in the original post (click the source link below to view them), and if you'd like, you can download the bare CAD drawings directly from Apple.
Wouldn't you love to see an officially-sanctioned black T-shirt (or mock turtleneck) with this silk-screened on it?