Many of us use Skype have more than one Skype accounts. The common situation is that we have one for private use and one for work.
With Skype we can use multiple accounts at the same computer - though it's not an obvious thing how. Here's the tip for Windows:
Start a new instance of Skype:
Start -> Run, type "C:\Program Files\Skype\Phone\Skype.exe" /secondary" and click OK.
Log in with your other account to the new Skype instance and you're done!