Twitterspy is a site full of ajaxy goodness. It follows the live twitter stream and automatically updates the page every second or two. The stream runs between thirty seconds and a minute and half behind the live stream. New tweets pop up at the top of the page and the old ones fade slowly out at the bottom of the screen.

I am somewhat dubious that the site actually displays all live tweets. Each post appears about a second or so apart. I'm pretty sure that Twitter has more than 60 posts per minute. Posts that I've made don't seem to appear on the page. MicheleM (the developer) has started a Google Group discussion to solicit feedback on the project which sheds light on why this might occur. First, Andrew Badera surmises the public timeline only updates once every four minutes. Second, Nathan Rixham goes on to indicate that there is no easy way to poll often enough to capture all tweets as there are 300-400 tweets per minute running through the system.

This is a pretty neat proof of concept, but is limited in it's use. There are no settings that allow you to target an individual or your own stream. I would likely make use of it frequently if I could customize the output. So @michelem, any plans to make this a configurable tool? That would turn this from being a neat experiment to being a truly cool tool.