I Do A Lot Of Bookmarking

I bookmark just about every page of my site(s) as well as various articles I've written and such. I use all the major sites (Mixx, MrWong, StumbleUpon, Delicious, etc).

I don't get very many (or any) "votes" or "fans" of my bookmarks but I'm wondering if the links themselves count at all toward my SEO efforts? Sometimes I feel like I'm just bookmarking for the sake of it, but would like to see a return on investment.

Some of my bookmarks themselves have ranked well, but I want my direct site to rank. SOOO... does anyone know of the bookmarked links get factored in by Google?

"do Follow" Craigslist Link?

I use Craigslist to promote some products I sell online. I use HTML to design my ads to give them a bit of branding and help them look non-generic.

Anyone know if I were to put a "do_follow" tag in my HTML whether or not those links would be good for SEO? I'm assuming that CraigsList overrides all links as no follow, but thought I'd ask if anyone knew for sure?