Ok.. Essentially, Skype is GOOD for you in the long run, it uses VOIP (Voice Over IP) technology to allow you to make phone calls through the internet, which is now available through 3G.. you will NOT be charged for minutes used while speaking with someone on the other end with a SKYPE account. They can either be talking to you on a PC or on their phone using a Skype app..
IF you want to use Skype to call actual phone numbers, THEN you have to pay, but you pay Skype, not your wireless provider..
SKYPE = FREE talking! if you know how to use it right..
The best thing to do, is to get the people you talk to most to create a Skype account, whether it be on their phone as an app, or their software for PC..
Much like twitter, Skype works best the more friends you have on it..
Soon enough, I am sure they will be integrating the Webcam Feature of skype to be used with Phones, and allow you to video chat with other Skype users with our phones!
Moral of the story being, It is great for some people, those who don't understand why, either check it out, research it, or just plain don't use it!

simple.