I'm so glad someone else started this thread.
I've been so tempted to start it myself, but I know I'd have the Search Nazis jumping down my throat.
I have just completed my 2-year contract with T-Mobile and am considering moving to Cingular for a Palm product (Treo 680, maybe).
Email functionality isn't as important to me as are things like browser robustness, availability of various apps, ease of use, etc..
Also, a HUGE BIGGIE -- does anyone know whether those Treos automatically change the time on the handset according to the location of your time zone? This alone would be get me sold, unfortunately. How sad is that?
I currently use a BB 8100 with T-Mo's network on the BB Minutes & Mail 1,000 plan.