When you and the person you're calling are both on Skype, the calls are free. Oh, and video calls are free too.
All possible actions:
Call link
When somebody clicks on a call link, Skype will make a call to the Skype Name in the link. You can even use it to call normal phone numbers for people who have SkypeOut.
Example
skype:user1?call (Skype-to-Skype call)
skype:+14035551111?call (SkypeOut call)
Add to Skype contacts
This link will add the provided Skype Name to somebody’s contact list. You can also use these links to add SkypeOut contacts. Sharing is good!
Example
skype:user1?add (Add user1 to contact list)
skype:+14035551111?add (Add number to SkypeOut contacts)
Start a text chat
You can use Skype links to start text chats with your friends - or even chat with whole group of friends together!
Example
skype:user1?chat (Start a text chat with user1)
skype:user1;user2;user3?chat(Start a multichat with 3 people)
Start a conference call
Just like starting a normal Skype call - except with lots of your friends at the same time.
Example
skype:user1;user2?call (Start a conference call with two Skype friends)
skype:user1;+14035551111?call (You can also use SkypeOut numbers!)
View a profile
People can see your Skype profile when they click on this type of link.
Example
skype:user1?userinfo (Show the Skype profile of user1)
Send a file
People can send you files by clicking on this link. As always, be careful about accepting files, and have your anti-virus scanner turned on.
Example
skype:user1?sendfile (Send a file to user1)
skype:user1;user2?sendfile (Send a file to multiple people)

Skype for Windows Features:
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Free Skype-to-Skype calls to people anywhere in the world.
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Call phones and mobiles at pretty cheap rates per minute.
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Instant message when it's not a good time to talk.
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See who you’re talking to with free video calls.
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Forward your calls and get text messages when you’re not online.
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Search the web with the Google Toolbar (optional install).
Skype for Windows System requirements:
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PC running Windows 2000 or XP. (Windows 2000 users require DirectX 9.0 for video calls).
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Internet connection (broadband is best, GPRS is not supported for voice calls, and results may vary on a satellite connection).
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Speakers and microphone - built-in or separate.
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To make video calls you’ll need a computer with at least a 1GHz processor, 256 MB RAM and of course a webcam.
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We also recommend that you have at least a 800 MHz processor, 256 MB RAM and 50 MB free disk space on your hard drive.
If you have any questions or
comments please call me on 0720390184
or e-mail me on webmaster@webcraft.ws.
Good luck and have fun searching.