X10 > X10/USB
The PowerLinc USB (1132U or 1132CU) and ActiveHome Pro (CM15A) are USB X10 interfaces and can be connected directly to your computer without needing any type of adapter
PowerLinc 1132U (USB) New USB interface. Supports all X10 commands.
Stores: funforgeeks.com , SmartHome and Aartech Canada. Aprox. price: $38
PowerLinc 1132CU (USB) New USB controller interface. Has built in memory, clock, and logic processing. Supports all X10 commands.
funforgeeks.com , Smart Home and Aartech Canada: $70
ActiveHome Pro CM15A (USB) New USB interface. Can send/receive X10 power line commands and receive X10 RF commands and 'security' devices all in one. Supports all X10 commands. Uploading to the CM15A is not supported by some companies.
x10.com . $50
http://home.comcast.net/~ncherry/common/cm15d/cm15d.html - cm15a - Linux daemon to the X10 CM15A USB transceiver