Remember when netbooks were the hottest item in PC land? You could hardly go a week without being buried under an avalanche of new netbook announcements. My, how things have changed. Strictly speaking, the netbook category is no more. Asus is reportedly ending its Eee PC line, and Acer hasn't announced plans to launch any new netbook models. The same goes for MSI and all the other netbook players. So, what happened?