Keyword Research 

Whether you are starting to SEO your site or building a PPC campaign, good keyword research is vital. The resources below will make the job of finding and assessing keywords much easier.

Keyword Research Resources

Google Keywords Sandbox

Get keyword suggestions straight from Google adwords with suggestions based on search terms used in Google searches.

Overture search suggestions (UK)

Works exactly the same as the main Overture search terms suggestion tool, but uses only searches on their UK network. Handy for UK targeted sites.

Overture search suggestions (world)

Overtures search term suggestion tool will provide you with lists of keywords matching your search ranked by the number of searches they received last month.

WordTracker

Possibly the current king of keyword tools. Scans results from major search engines to suggest keywords, rank them on popularity and even assess how much competition there is for each. Commercial but very reasonably priced.