Seeing this directory also led me to check out the website it came from, Scribd. Scribd is a website that allows you to "Publish Yourself Online." You can upload your own documents if you'd like to have a worldwide audience and possibly get feedback from the community. You can also explore their library of "over 12 billion words" to find documents that might be of interest to you. Once you join the website you can save any documents you like by marking them a "fave", or even download the document to your computer. If you'd like to share the document on your blog, you can easily get the embed code right above the document (that's how I managed to include the Web 2.0 Directory here).
Once you join, add me as a friend. I'm McTeach there also.
Read this document on Scribd: Web2-Directory