UPDATE 11.27.07: Apparently the Canvas code can’t capture pages that have Flash objects embedded within them.  For that, you need to use the Java/JRE code.  See here.

This is nice: an extension for Flock that allows me to take OneNote-style screenshots from within the browser.

Screenshot 0.0.3 by mctones

Sample partial-page capture: (click to view full size image)