Others

Google Spam Report Tool

If you find any website that uses black hat seo, you can report it at this anonymous location.

Yahoo Spam Report Tool

A similar reporting tool for yahoo. Use this tool and google's reporting tool whenever you find a webpage for which you have reasonable grounds to believe use black hat seo techniques.

Google Reader

Google Reader is an online Web-based aggregator, capable of reading Atom and RSS feeds and sharing them. It is included with firefox and google personalised homepage.

Google Blogger

This is a blog publishing system which allows your blogs to have access restrictions, RSS feeds, and is incorporated into the google toolbar.

Technorati

Technorati is an open source search engine for searching blogs. It looks at tags that authors have placed on their websites. These tags help categorize search results, with recent results coming first.