I normally have good luck at cnet - also there is a site called mobayou.com that normally has great reviews, but it looks like they are doing a site redesign right now.
What ever you do dont get the ppc 6700 by audiovox... it is big and clunky sure it has a great keyboard but it looks liek it is from the 70's and with windows mobile weighting down forget about doing 2 things at once. I would wait until the phones get faster and bigger cameras etc.. i am wating for the phone that has a projector! How dope would that be for watching video just project it to a small screen.. siiiick!
I have the blackjack and it is SICK. Blazing fast and full of memory. The only problem it has is that its windows! It crashes with too many apps open and can't handle big memory dumps.
I have a treo with windows and if you go into settings and memory you can close all the running programs. My treo use to crash all the time and get real slow but now it is money.