Researching mobile phones I came across an invaluable site: CNET Reviews (Mobile Phones).

Reviews and advice on cell phones, smart phones, Bluetooth headsets, and cell phone accessories.

On this site you can find your ideal phone by price, manufacturer, service provider, wireless interface, built-in options, and editors pick of smart phones, PDAs, or cell phones.

Good research site for people living in USA. However, I have learnt a lot from this site that has not had direct effect in my marketplace. Worthwhile a review of this site regardless of which country you are from.