Handy little app to check a url's pagerank.
Scribe is an easy to use SEO tool that analyses content (blog posts, etc) and suggests ways to improve it based on SEO best practice. It also provides a keyword research tool that shows search volume for related keywords to the one entered. Useful. Pricey
Get a grade for your twitter profile. I was rated 1m out of 8m, whatever that means. Used by pay4tweet.com to gauge price of paid tweets.
Nice social bookmarking plugin for WordPress. Creates really slick pop-up icons that are half hidden and jump upwards on mouseover. Very cool. From shareaholic.com (and maybe somebody called Josh Jones).
Nick Craig's own internet marketing company.
PRWeb is an online press release distribution company. They charge $80 / $120 / $200 / $360 for different levels of service, including Associated Press distribution at the top end. It includes sites like Yahoo News and Google.
A simple explanation of how to use .htaccess to redirect from www to non-www or vice versa.
Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling.