Regarding HomePlug AV, this

Regarding HomePlug AV, this solution is also prone to interference. I have been testing an item (review forthcoming) and the technology is unfortunately subject to problems when you begin dealing with bandwidth requirements over ~10 mbps. Like wireless, it can potentially be viable in the correct environment. With Powerline, you can have problems especially if you have a plasma TV. You also need to worry about other possible offenders (hair dryers, large appliances, etc.). With HomePlug, you must also be sure to have a free outlet to plug the equipment into as surge protectors will also decimate performance.