After one week of inactivity I started bookmarking my sites. I chose some well known sites and several others that I had found through research. I bookmarked each site and several others for a friend so far to 30 popular bookmark sites and almost 40 of the 'unknown' ones.
The site that already had some juice maintained it's ranking for 7 of the 10 keywords that I searched (keywords that had been used to find me in google) and improved it's position in the main three.
KW1 went from 12th to 6th, KW2 from 6th to 2nd, and KW3 from 47th to 35th...and strangely enough, the main keyword that the blog is designed to eventually rank for went from off the charts (not included in the top 100) to 12th!
Does social bookmarking work? You be the judge!