Try magicJack for free!

Plug ANY phone into the Magic Jack, then the unit into your USB port on your computer. Then you make calls as usual. If you're interested, head over here to sign up for the free trial offer!

100% RISK FREE,
30 DAY FREE TRIAL
Get your magicJack and one year of Free Local and Long Distance Calls.

* On the 31st day you will be charged $39.95 plus $6.95 s&h

Here's some terms from the site:
Get your magicJack and one year of Free Local and Long Distance calls. In the unlikely event you didn't fall in Love with your magicJack, send it back (no questions asked) within 30 days and you owe nothing. There is NO RISK! We only bill you when and only when, you decide to keep your magicJack. Start saving right away!

How much does magicJack cost?
Each magicJack costs $39.95 plus shipping and handling. This gives you one year of calling to the USA and Canada.

You can purchase an additional year's service for $19.95

Some reviews of the product and service here and here.

I personally use Vonage, but am SERIOUSLY considering this switch. Would also be a great item to have for the person who travels a LOT.

CHECK IT OUT!!!