UPDATED: Chrome's Extension subsystem keeps evolving. The latest changes break my extension and so I'll wait until Chrome is more stable before attempting to reissue this one.
Diigo's bookmarklet is nice but having to press the bookmarklet button each time I visit a site isn't much fun so I decided to package an extension for it: the extension is available here.
For those of you who do not know Diigo, one feature that distinguishes it from the other social bookmarking sites (such as Delicious) is its highlighting feature.