Whether you use a netbook or an ultramobile notebook (same difference!), the one of the most important requirements in my view, particularly for the very mobile worker, is that it has a significant battery life – whole day preferably.
The only problem with many 6 cell batteries is the sometimes awkward shape and the additional weight that it generally gives the notebook. In fact when I come to replace my existing machine, I will be looking at those machines that give at least 5 hours of battery life. How about you? Do you believe battery life is so important?