I've noticed that microblogging sites help in quick indexing of new sites or web pages. Sites like Twitter and FriendFeed are examples of microblogging sites. These sites are authority and high PR sites.
Google prioritizes high PR and authority sites when indexing pages. Indexing starts from PR10 down to PR0 sites. If your site's link is visible in a high PR site, chances are your site's link will be crawled by a spider faster than other sites not linked to the high PR site.
I tested and confirmed this SEO technique when I was trying out a microblogging site. I posted a link to my site on this microblogging site and checked Google from time to time. My Google indexing time took 15 minutes only and my site's keyword rankings improved.
I believe that if you mix microblogging and social bookmarking sites as one of your link building techniques, then you will have a quick Google indexing time plus gain more traffic and one-way links.
Check it out and tell me the results thru your comments.
