Power Line Ethernet
HomePlug® Ethernet. run ethernet through your powerline. 85Mbps or 14Mbps. Several reviewed mfrs are reported to have adapters that had meltdown problems due to heat buildup.
Linksys PLK200 200Mbps powerline ethernet adapter, available at newegg$165/2
unit actually does 50-60Mbps. no complaints of meltdowns so far.
SMC HomePlug, available at smc
Airlink101 APL85511/22, available at airlink101