Go to this site to see how your blog stacks up. This is a cool tool because you can check Google Page Rank, Alexa Page Rank, Technorati Blog rank and/or Yahoo! Search Inlinks!. All in one place. I'm not sure which one is the definitive one, but I think it may be Technorati. What do you think?
I actually really like this tool, but wanted to note that you need to submit your blog to each of these blog rankers to show up and it's a bit of a process that will take a few days at least but well worth it!