I know this is basic and many of you already do it but here ya go anyway. 1. Go to google trends. 2. Click on the keyword that suits your needs or otherwise. 3. When you get to the page that that keyword leads to look for blogspot.com blogs in that pages results. Many times there will be none but sometimes you will find a few in an average day. 4. Post a comment. Not all allow this but the ones that do are usually older pages that have PR rank and no moderation because they don't know that their page is showing up on google trends. I get a few links a day using this method. Sometimes they are really good ones, mostly just regular.