I have been taking Mini-Disks to Europe when I call ... no problem ... do you take your laptop and if so have you found any problem taking it through the different borders?
There's no problem taking a laptop into Europe. It's certainly less noticeable than carrying a big record case full of records.
The power transformer that comes with the laptop usually handles 100-240 V 50-60Hz, so there's no problem with power conversion.
Just be sure to bring an electrical plug adaptor for the country you're visiting.
I get my adaptors from Magellan's Travel Supplies