After recommending magicJack so heartily, I felt it was my obligation to inform about some recently discovered shortcomings.
It would appear that currently, there is no easy way to un-install magicJack from your computer.
[NOTE: Be certain to scroll down and read the comments!]
Do note that the above post was generated on November 16, 2007; however, the comments continue to the date of this post [My 28, 2008].
While I don't find this a particularly troubling circumstance currently, I thought that those I had recommended this service to should be advised. I will keep checking to see if magicJack will be creating a solution for this problem.
If you wish to continue to magicJack: