pixelrage

Top notch social networking site for professionals. It's the corporate Facebook.

A cool social networking & bookmarking concept: it's kind of like Tagfoot.com and YouBundle.com rolled up into one. Create a channel, add relevant bits and pieces to it (articles, videos, anything you want) and invite people who have the same interests. Everything you add becomes instantly available to the public via the front page, and can be voted & commented on with the speed of a Twitter tweet. Very addictive with a clean interface.

A decent bookmarking service. Nobody is certain if it does anything whatsoever in regard to backlinks and promotions (most likely, it does not), but Google conspiracy theorists may claim that it adds some sort of value to a site's SEO efforts.

Find alternate keyword queries based on a single web page and its content. Interesting tool for Adwords users, and for those seeking alternate keywords to SEO their sites' pages with.

Use Google Trends to get a graphical representation of a keyword's popularity through the past several years. Interesting to look at, but I haven't found it to be overly useful. Use it as a component of your keyword research methods, for sure.

A must-have tool when researching keywords in foreign markets. I use it before shopping for domain names, too.

One of the few Youtube video saving tools that works well for me. As usual, you'll want to re-name your file the instant it is finished downloading.

A top notch system for affiliate marketers, and also a great venue to sell stuff (especially if you're a web designer selling templates) and run your own affiliate program.