I absolutely love Skype. It's free to call other people from your computer, over the internet, to another computer. You can also call cell phones and land lines on a pre-paid program for like ONE CENT a minute. There is great reception and no cost to use their software. I've held business meetings using Skype. They even have open source affiliate software programs on their application for holding meetings, whiteboard, sending pictures, etc. Many of them are free as long as you have less than 15 or 20 on the phone and meeting at the same time. It's super easy to use. You just go to skype.com, sign up, then download the software, log in. The application menu looks similar to that of Yahoo and Hotmail. You have the same options of sending instant messages. To use computer to computer phone calls, both parties have to be a skype user. However, if only YOU have the skype service, then you can call from your computer to their cell or land line for about ONE CENT a minute.
For example, I called a business consultant in the United Kingdom several times. We talked over the internet, computer to computer, both skype users, didn't cost us a cent. A couple calls lasted about 30 minutes and one lasted over an hour. If I would have used my cell phone, I would have paid about $2.50 per minute or would have been required to upgrade my phone plan.
I do suggest investing in a headset with microphone. You can find a decent one for about $20. I bought a $60 headset with microphone, and the only difference I find is that the more expensive one is more comfortable to wear over long periods of time. You can buy a headset practically anywhere, Wal-Mart, Meijers, any electronics store, etc. I even found them at pharmacies.
I found that the speakers on my laptop would make my voice sound echo-y to the listener. It sounded fine on my end though. I had perfect reception. No breaks or static on the line.... especially for such a long distance call. Often calling internationally or to Hawaii, my cell sounds as if the person is standing really far from their phone as they talked. I can hear and understand people much better over the internet than my cell phone.
You can also add a video cam to your computer and then you can see the person you are talking to. I have used that for business and school. I love Skype!