There is another majicjak type device out there. Netcom I think? Very similar, but does not need a pc to connect to the web. I think all you need is an ethernet cable to connect to a modem. Looks great for travel, etc. But nice that you don't need to run a pc and it's power supply all the time to have constant phone service. I've never used it, so I can't attest to the quality of service, etc. I've been using Vonage for a few years now and it works good. Much cheaper than the old service I had from the phone company, plus all the perks that they charge extra for.
-James