I got this from the commuting forum and have bought a few to try them out myself. I wore one today for my first try out and I can tell you....these shirts are GREAT.
Some already know about them, I'm sure. In that thread, I think Chipcom said he's been wearing them for a few years on commute already.
Anyway, if you want to be SEEN on your bike, then look at the ALERT SHIRT.
Many have reflective tape as well
Large sizes, comfortable fit