Excerpt: If you need a laptop that's light as a bag of feathers, yet still powerful enough to do some serious work, a netbook might not fit the bill. For £300 you can't expect everything. Small keyboards, low resolution screens and equally low performance are the order of the day. If you fancy stumping up over 1300 quid on an ultraportable laptop, however, things look very different. The Portégé R600 is about as slim and light as they come.