Thanks.
Actually, the trailer doesn't open up into anything amazing, although I've seen some that do. Perhaps the most spectacular is
this one from Omaha, pulled by an Xtra-cycle. It's built on the same
Bikes-At-Work trailer as ours, but they went all fancy schmancy with sliding smoked plexiglas doors and stuff.
While not fancy schmancy, it's very nice and the lighting is just too cool!
Boston's is far smaller,(and based on a Surley trailer) but does open up:
http://www.bpl.org/press/tag/bibliocycle/
If first generation library trailers look this good, I can't wait to see what the 2nd generation looks like!