Today Smashing Magazine published a long list of web-generators that make the lives of Web developers easier.
The list of generators is divided into sections such as color, CSS, domain names, Web forms, metatags, robots.txt, RSS, sitemaps and more.
Some of these tools are definitely worth checking out.
More and more blogs, link directories, and other types websites tend to add the
rel="nofollow" attribute to external links to tell search engines not to follow them, meaning that the Google PageRank is not inherited by the externally linked pages.
Clearly this is bad from an SEO perspective for the external pages but may have a positive effect for the internal website links, because they receive more value. This seems somewhat egoistic but hey we all know that money makes the world go round and website owners will argue that they only do it for spam prevention.
The Search Engine Decoder is a tool that displays the relationships of various major search engines. Use this tool to see which search engine supplies and receives its primary and secondary search results, directory search results and paid results to and from which other search engines.
You can also display ownership relations and the Nielsen Netratings (percentage of all web searches) for each search engine.
GrayBit offers a tool for converting the colors of your website to their grayscale equivalents, so you can test the visual contrast of your website. Like most other Web 2.0 application GrayBit has it's limitations and works best on websites that make use of cascading style sheets and a standardized markup. Nonetheless it's well worth trying this on your website as an additional tool to test this aspect of accessibility.