Blogshares allows you to virtually buy/sell shares to your blog or others. You do not need to use a blog to buy shares of another. Try your luck on predicting the next big popular blog (this one) and log into blogshares.
GeoURL is pretty cool, it shows you what URL's are geographically near your. I have just added my URL to its database, and in the links section of my page you will see the GeoURL link, click it and see what URL's are near me.
Update: I removed Blogshares, as fun as it is, it doesn't work very well yet.