I visited an AT&T store in Danbury, CT recently. The store was loaded with many displays.
Here are a few pictures:
Accessories (blu-tooth headsets, etc.) in an acrylic case atop a locking cabinet; Three-sided take-one for cases; A large iPhone kiosk with video display and live product samples (video showing 3GS model) and a cloth banner sign for the 4GS model; U-Verse floor stand with brochure take-one's on top; and a peg-board floor stand spinner for more accessories.