Is it possible ?

[SplashLT]

Is it possible to hack a skype ?

[Rizla]

I'm sure there is many ways.

[ZoneHax]

Since there wasn't much of an explanation here i'll explain , Even though this thread is extremely old ,Just in case someone scrolls and have a look.
There are 3 ways you could jack someones skype.
1. Social Engineer Skype.com
2. Bruteforce
3. Database lookup.
easy things to do.