Once a while is handy to be able use Skype from somebody else computer. In this case one can copy Skype and personal data (contact list) to USB flash drive. Here is what could be done. This example is using Windows 7.
md F:\Skype\data copy C:\Program Files (x86)\Skype\Phone\Skype.exe F:\Skype xcopy %USERPROFILE%\AppData\Roaming\Skype\yourSkypeName F:\Skype\data\yourSkypeName\ /s
Now is possible to invoke Skype, for example from F:\Skype like this:
start "Skype" Skype /datapath:data /removable
Skype version (32 bit version) 6.3.0.105 has size 18,642,024 B, user data can be like 4 MB.