How do you know when you’ve made it as a blogger? Sure, web access log analysis will give you an idea of how many people are reading your thoughts and ramblings. You may even pick up some mention of yourself on other sites. But I don’t think it’s until people start to referring to you by your surname only that you can say that you’re now Internet famous (or notorious as the case may be). Doctorow, Gruber and Kottke, Scoble and Thurrott I’ll let you decide who I think falls in to which category.
Of course, if you reach true uber geek status you get assigned your very own TLA like PPK or JZW.