Well I just picked up 2
Trendnet TPL-303E2K 200MBPS Powerline AV Fast Ethernet Adapter Kit and it is AWESOME to say the least. Everywhere I have a power plug I can have Ethernet internet.
Setup is so simple and take less than a minute and bam you have ethernet everywhere.
I did some speed tests around the house and it is faster than my wireless as far as ping but the same download speeds as wireless when the wireless single is strong but if you are in an area where the wireless single is weak the powerline ethernet is faster.
I haven't tested file transfer over the network but I assume it will be a lot faster than wireless N.
Here is a great video that compares all 3 internet solutions.
Powerline vs Wireless vs Ethernet Networking (NCIX Tech Tips #52) - YouTube