looking for website that sorts cellphones by criteria. e.g., if i want
a small, flip phone with polymorphic ringtones, etc....

Just a comment:

I've used "Let's Talk" before and was very pleased with the way I
could search by 1.provider, 2.by phone and 3.by plan.  The screen is
set up with three columns and at the bottom you can change each column
to get a new deal. Many times the final amount you pay for the phone
is $0 and in some cases you actually make money on the purchase-
assuming you sign a 1 year contract:)  Most carriers require that
anyway.  To see ALL the details on each phone just click on the
picture and the chart tells you exactly what it has like customizable
ringtones, text messaging etc...
if it sounds interesting to you, check it out -----> 
http://www.letstalk.com/product/promo.htm?depId=1&pgId=100

Just realized something about the link I provided...
I think some aspects of Let's Talk are region specific so you'll need
to change the zip code in the upper right hand corner to see what
specials are available in your area.

Yes, my experience, too, has been that the Let's Talk site is the most
extensive database of cell phone deals on the web.

darrel-ga