If you are interested in manipulating the WordPress WPMU platform into creating thousands of blogs in one fatal swoop this will do the trick. I have written a web based application that will read a csv file which contains a list of the blog sites you want to create. It can be in the 100s of 1000s if you like. Simply dump the file content into your www root directory that you have WPMU installed in and visit the web page.This hack does not create content and if you looking to use this tool to create splogs, I strongly encourage against it and not just because I don't like splogs and MFA sites. You are wasting your time and your more than welcome to do that. Our company does WordPress blog site theme integrations for the corporate world as well as search engine friendly ecommerce websites and professional seo and sem services . We strongly encourage blogging not only for SEO & SEM purposes, but as to take part in the new era of social networking.This tool is to used for large blogging platform projects. E.g. If you were to have a mountain climbing site in which your wanted a blog about every mountain in the world. You can use this tool to import a csv list of all the mountains very quickly to create a separate blog for each mountain. e.g. acadia.mountainclimbersblog.com.  If you would like more information on this tool and how we use it, check out the mass blogging post within our company blog.