KitGuru tried the Asus PL-N12 WiFi HomePlug AV500 Powerline Adapter Kit
A quote from the article:
The Asus PL-N12 WiFi HomePlug AV500 Powerline Adapter kit is a relatively simple pair of adapters that simultaneously extend network range over both power lines and wireless. Designed for affordability, with support for wireless standards up to 802.11n, it supports an encrypted wired signal over power lines, adds a second Ethernet port to the main access point and has a useful standby mode to cut energy use when idle.Asus PL-N12 WiFi HomePlug AV500 Powerline Adapter Kit @ KitGuru