There's a very useful plugin that got my attention. Recomended by (who else than) dsader.
http://www.ringofblogs.com/2008/07/31/wpmu-new-blog-settings-plugin-updated/
So, I would like to see if any of you guys could come up with some interesting new-user-blogs-solutions that community could benefit from. Please post the code that could be added between these two lines of the plugin:
//set your options here:
// stop editing here