Google Browser Size App: a new tool added to my toolbox

"Google Browser Size is a visualization of browser window sizes for people who visit Google. For example, the "90%" contour means that 90% of people visiting Google have their browser window open to at least this size or larger." Read full description here.

I am excited to use this tool as a part of design presentation. I just wish it had a heat-map option similar to 3M's Visual Attention Service, so my clients can not only see what's "above the fold", but also a heat map of what elements draw get most attention.