I guess many of you have tried it but wanted to share what i do and see what are your results with it. What i do is get all the links to one of my kinda established sites. - I download all the links from GWT - All the links from MajesticSeo - all the links from yahoo site explorer - all the pingbacks (by logging into phpmyadmin and exporting them straight from the DB) I merge those lists together, filter or dupe URLs, write down how many of them are not indexed and do a 10k auto approved blogs comment run. (to all of them, not just the non-indexed ones) The thing is that now 6 days later after the first run, i haven't had any significant amount of new indexed URLs. Have you had any succces with this or similar method?