There's no doubt in our minds that the Samsung Series 9 (NP900X3A) is one of the best laptops we've ever seen from a design and portability perspective. If you travel a lot, but need a powerful machine to work on, there's no doubt this is a great choice.
The only letdown if the fact that it comes installed with Windows Home Premium, making it slightly unsuitable for use in a corporate environment. It doesn't have all that much in terms of extra security (Bitlocker isn't included in Windows Home) and remote management might be a problem too.
As a laptop though, it is both sleek, desirable and powerful. If you can work around the limitations, it won't disappoint.