An update to the official Yahoo Messenger app has just brought video calling to 4th generation iPod touch users. The video calling features was originally launched for iPhone 4’s only, allowing users to make video calls between computers and their iPhone over 3G (although WiFi is recommended). There is also the regular set of bug fixes included in this latest update that should fix any problems you might have been experiencing.
You can grab version 2.0.1 of the free Yahoo! Messenger app here.