I got some pretty interesting reactions on the groups.google.com. My question was:

I am looking into bike shoes. Is it the same like shopping for regular shoes, that they only have to look good and be comfortable?
What should I be aware of?

If you have a wide toe box, and your feet swell, Sidi Megas are the only
shoe that I found that works.  If you are planning on doing >125 miles or
very long endurance rides your feet will swell more than you think.  Put on
some very heavy winter socks (hiking type) when you try them on.  If they're
tight, they're too small.  Now if you are only going to do 20-50 miles,
almost anything will work.  Don't make the mistake I did, hot foot (foot
swelling in too small of shoe) is about the most uncomfortable thing I've
ever gone through in cycling.  They should be tight near the heel, but there
should be plenty of room where the toes are.  Remember you can always put on
more socks, but you can't make the shoe bigger, they don't stretch like
tennis shoes.

Snug fit in the heel cup
 -Snug in the mid-foot and across the arch
 -Not-as-snug in the toebox..NOT loose or sloppy, just not tight
 -Good adjustability - when feet swell, it's nice to be able to reach
down and adjust
 -If you live in a hot area - more mesh, less leather/synth leather

Greg : When you try them on, don't stand up like you do in street shoes
because you aren't concerned with walking.  Instead, assume a position
as you would on the bike (squat and lean forward) and stand on the
balls of your feet (no heel on the floor).  This simulation will be
good to find out what happens in the toebox with the pressure applied
to "business area" of the shoe.  If your toes touch the end of the
shoe, I personally, would not buy them.  You will get "hot toes" or hot
spots from friction.

Ideally, you would mount up some cleats and jump on a trainer in the
store.  Seems a bit obvious, but the store couldn't have 157 different
shoes to mount 6 different cleats to.

(more to come..)