A few people have been complaining about the bandwidth things like PodCasting take up ( Duh!).

I'd recommend they look at using the Coral cache. If you haven't tried it, it is a free content distribution network (think Akamai). It does run on port 8090, so people behind some firewals can't use it, but for for a lot of people it will both give them quicker downloads and save you bandwidth.

For instance, the Coralled version of this page is http://www.mackmo.com.nyud.net:8090/nick/blog/.