If your web site makes use of any of the more popular javascript libraries, including jQuery, that are used for AJAX operations you may be able to benefit from a new free service.
This new service from Microsoft makes use of their thousands of geographically distributed servers. By pointing to their servers instead of yours for these script inclusions you benefit twice; your pages load faster because the ‘weight’ of that download is shifted onto a server that is likely faster and closer to the viewer, and you get to skip that amount of bandwidth being incurred.
Depending upon the speed and location of your server and the visitor, the improvement can be quite noticeable.
Read more and see code snippets at http://www.asp.net/ajax/cdn/