tedster - 3:15 am on Jul 2, 2011 (gmt 0)
There are other potential metrics a browser would register that could be used to remove a lot of the noise from a simple "bounce rate" metric.
1. Time spent on the page
2. If any scrolling occurred
3. Did the cursor hover anywhere - especially over drop-down menu areas
4. Was the page bookmarked
5. Was any text copied