well seach for imacro ... script you will get it easily...
change it little bit according to your liking .... and if you are not able to find it then pm me I will get it for you.... i have it somewhere on my HD......
if you are searching for blogs... then.... you may also like to use free blog commenter.... instead of commenting use it for harvesting...I have my own scraper
and another free one is scrape genious.. you need to register.. for using it...