I wil only post about the free things:
This is great for just talking to firends-
You’ve downloaded Skype, and so has your friend. Now you can get started on the really cool stuff – such as making completely free and great quality calls from your computer. That’s the great thing about Skype, you can use your internet connection and turn your computer into an internet phone and make free Skype-to-Skype calls.
You and your friend will need to have a headset (or use your computer’s built-in microphone and speakers) to talk to each other. You can really improve the sound quality of your calls with a headset, or take your calls to the next level with free video calls.
THIS is great for interviews-
Video calls can make conversations much more interesting and intimate. You don't have to tell someone about the steps you learnt in tap class, just show them off.
And much much more ladies and gentlemen. If you have any further questions contact me through u2u or go to Skypes FAQ.