Review: Motorola Backflip
Browser
Android's default web browser is based on WebKit and can render full HTML web sites. The browser is very capable and works well on the Backflip. Other than the baked-in Yahoo home portal, I didn't notice any other AT&T or Motorola customized features. Oh, except for the presence of Yahoo's crappy search client.
You can use your finger to navigate around web pages directly on the screen or use the touch pad on the back. There is a full list of settings that let you customize how the browser operates (such as enabling / disabling JavaScript, managing passwords and privacy). My favorite feature is that the browser lets you open multiple windows at a time. This lets you jump around between different web sites quickly.
Browsing speeds over AT&T's 3G network were good. Other phones on AT&T's network do better.
Customize
You can customize the Backflip about as much as you can customize any smartphone platform. Wallpapers and ringtones are easily altered. You can rearrange all of the menu items, clutter up the home screen with icons and more.
There are pretty robust ways to control the security of the Backflip, how applications are managed, how the microSD slot is managed, how data is synchronized, how location information is reported and on and on.