Free online tools 2

Google Insights:
http://www.google.com/insights/search/#

Keyword Discovery:
http://www.keyworddiscovery.com/search.html

Wordtracker Keyword Questions:
http://labs.wordtracker.com/keyword-questions/questions?seed=shoes&commit=Search

MSN Search Funnels:
http://adlab.microsoft.com/Search-Funnels/index.aspx?kwd=dell&direction=out&filter=top&filternum=5&newsearch=true

Spacky:
http://www.spacky.com/

Free Backlink Analyzers:

Analyze Backlinks:
http://www.analyzebacklinks.com/

Backlink Watch:
http://www.backlinkwatch.com/

Yahoo Site Explorer:
https://siteexplorer.search.yahoo.com/