A post on Todd Malicoat’s blog - Jim’s Got Some Killer New SEO Tools points out some nice SEO tools from WeBuildPages.com

1. 1. Top Ten Analysis SEO Tool
2. 2. Backlink & Anchor Text Tool
3. 3. C Class Backlink Analyzer Tool
4. 4. Common Backlinks Tool
5. 5. Sitemap Tool
6. 6. Top Competitor Tool
7. 7. Strongest Subpages Tool
8. 8. Forward Link Title Tag Tool
9. 9. Internal Link Title Tag Tool
10. 10. Internal and External Link Title Tag Tool
11. 11. Age of top 100 Websites with Backlinks Tool
12. 12. Deep Link Ratio Analysis
13. 13. Cool Cache Tool
14. 14. Down and Dirty Backlink Check Tool
15. 15. Search Combination Tool
16. 16. Keyword Density Analysis Tool
17. 17. Spider Viewer

Looks like google are launching a website optimizer which you can sign up for on the following page

http://services.google.com/websiteoptimizer/

Its not live yet but you may aswell join the queue

View how much people are bidding for an ad placement on overture
http://uv.bidtool.overture.com/d/search/tools/bidtool/

UK Keyword Assistant: View the number of searches performed on overture in the UK last month for a certain keyword or phrase
http://inventory.uk.overture.com/d/searchinventory/suggestion/

Japanese Keyword Assistant: View the number of searches performed on overture in Japan last month for a certain keyword or phrase: キーワードアドバイスツール
http://inventory.jp.overture.com/d/searchinventory/suggestion/

Danish Keyword Assistant: View the number of searches performed on overture in Denmark last month for a certain keyword or phrase: Værktøj til Søgeords- Forslag
http://inventory.overture.com/d/searchinventory/suggestion/?mkt=dk

Netherlands Keyword Assistant: View the number of searches performed on overture in Holland last month for a certain keyword or phrase: Tref woord suggestie -tool
http://inventory.nl.overture.com/d/searchinventory/suggestion/

Austrian Keyword Assistant: View the number of searches performed on overture in Austria last month for a certain keyword or phrase: Suchbegriffe finden
http://inventory.at.overture.com/d/searchinventory/suggestion/

Swiss Keyword Assistant: View the number of searches performed on overture in Switzerland last month for a certain keyword or phrase: Suchbegriffe finden
http://inventory.ch.overture.com/d/searchinventory/suggestion/

Korean Keyword Assistant: View the number of searches performed on overture in Korea last month for a certain keyword or phrase:
http://inventory.kr.overture.com/d/searchinventory/suggestion/

Spanish Keyword Assistant: View the number of searches performed on overture in Spain last month for a certain keyword or phrase: Herramienta de sugerencia de palabras
http://inventory.es.overture.com/d/searchinventory/suggestion/

Italian Keyword Assistant: View the number of searches performed on overture in Italy last month for a certain keyword or phrase: Selettore di parole chiave
http://inventory.it.overture.com/d/searchinventory/suggestion/

French Keyword Assistant: View the number of searches performed on overture in France last month for a certain keyword or phrase: Voir mots clés recherchés
http://inventory.fr.overture.com/d/searchinventory/suggestion/

Nordic Keyword Assistant: View the number of searches performed on overture in Norway last month for a certain keyword or phrase:
http://inventory.overture.com/d/searchinventory/suggestion/?mkt=no/

German Keyword Assistant: View the number of searches performed on overture in Germany last month for a certain keyword or phrase: Suchbegriffe finden
http://inventory.de.overture.com/d/searchinventory/suggestion/

Chinese Keyword Assistant: View the number of searches performed on overture in China last month for a certain keyword or phrase: 關鍵字建議工具
http://inventory.overture.com/d/searchinventory/suggestion/?mkt=hk