IRC is blocked at my work and I enjoy sitting in the chat rooms for live podcasts on my lunch hour while I listen. I'm fortunate to have rolled my unlimited data iPad 1 plan over to my iPad 2, but sometimes being on 3G can get annoying. But I don't want to drop the chat room connection either.
If you have a service like IRC that's blocked by your WiFi or you'd prefer using 3G network than WiFi then this is the ticket.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20110527131412432