Tip # 1:
Don’t stuff keywords in comment tags. Use comment tags in the manner in which the tag was designed to be used — to place comments about the page itself. Don’t put keywords in comment tags at all.
Tip # 2 :
Have you ever felt like you were running low on ideas in Wordtracker?
Try using the tool http://www.thesaurus.com to look up multiple new synonyms which you can explore further in Wordtracker.
Tip # 3:
Place a robots.txt file on every domain. The first thing a spider looks for when it hits your Web site is a robots.txt file. If it’s looking for that file, put it on your site! Robot Manager Pro is an excellent tool for creating robots.txt files as well as monitoring spider traffic