Remember the large fonts, shiny surfaces and lickable buttons from a few years ago? Although there was some confusion about what exactly Web 2.0 was (a movement? a structure? a style?), there were definitely design elements that were emulated, copied and recycled.
The United States Postal Service has never been known for cutting-edge anything, but their take on Web 2.0 style heralds the tail end of this trend. Icons that cast a shadow as well as a reflection? Really, USPS?