One interesting design problem that's presented when dealing with critically accessed pages like Google is tradeoff. Meaning: An interface feature that could add weight to the page could place significant stress on overall bandwidth and server resources owing to the large number of downloads.
For fun, I just wanted to see if I could achieve a balance between the addition of event-based-feedback and Fitts'-Law improvements and the resultant total character weight. I found, surprisingly, that I could make some changes and actually lighten the page.
The changes and their net weight change:
Net weight change: Trimmed about 1KB. (Specifically: around 698-972 bytes depending on the character set of the page.)
I also altered some HTML and CSS to mimic what I suspect is the result of server-side application logic regarding Netscape 4 and charset ISO-8859-1. These changes would not actually have to be implemented for the above changes to work.
Already a fantastic page.