Oh yes, if you like to know the weight of everything, this is for you.

http://www.tenpoundbackpack.com/

The 'compare backpacking gear' menu on the right handside of the page is where it's at

I reckon there is more knowledge on this forum than on there

Thats pretty cool Stu.

It's shame it looks like claimed weights, but non the less it looks great for general comparisons.