RSS feeders are a popular inclusion in browsers these days, and although I personally don't bother with them there may be people that would benefit from a built-in one. Just an idea that shouldn't take too much hassle.

It should be fine, libxml is required by webkit allready, so I could easly take advantage of that.

Thats good to hear. Also a tab previewer such as the one in IE7 b3 might be nice.