These tools I have found to be the most productive, and believe me, I think I've just about tried them all. So I figured I'd share some of the info with you guys and see what you think of these tools.
1. Wordpress CMS installed on own server with unique domain. Number one for a reason.
2. All in One SEO plugin. It's free and makes seo tasks so much easier
3. Automated robots.txt creator
4. Google Analytics.
5. Google Sitemap generator plugin.
6. OIO Publisher, is only $47 and is invaluable if you want to sell your own ad space
7. Smart DD Electronic delivery software. If you want to sell your own ebooks or software, then this is a must have.
Research shows they are the best.