A compiled list of top10 SEO Tools you should be using.
1.Page Strength
2.Google Webmaster Central (monitoring the actual incoming anchor texts: Statistics -> Page analysis)
6.URL Rewriting (through mod_rewrite)
10.URL Code Status Lookup
These are the top 10 tools that I use when I’m either looking at buying a link, contracting for a link exchange, submitting to a directory, or just generally looking at links that might work for my sites