Are you willing to share with us an idea of how major your "major" keyword is, how many comments you made and on what PR of site? Just as a flavour of what's doable.If you can take efforts to find pages on do-follow blogs which have high pagerank and few comments and then putting comments that don't like spam - you'll get rewards. I got one of my 1 month old sites on page #1 of all 3 search engines for a major keyword just by blog commenting and social bookmarking.
I have heard guys say that pages with more than 50 outbound links do not effect the page rank of your site.. Does anybody know if this is true? If so, then surely most blog commenting techniques are worthless?
This was the first thing I thought of when I first saw this thread....
Remember, PR is an important indicator of link-power but it is not the whole story. There may be other good reasons besides PR to get your link onto a page.
A link is still a link. These links might prove very useful for easy-moderate difficulty.