I wrote a small greasemonkey script that adds "add to del.icio.us" links to google results. It's very basic, but it works.
The script is in my blog (the site is written in Hebrew, but I add a few words in English with instructions and stuff). I'd be happt to recieve feedback.

The script is here:
thebetatech.com/archives/2005/ ...
and you can contact me here:
betathebetatech.com