The problem with netbooks is that they lack optical drives. I learned that the hard way when I used my netbook at CES earlier this year and everyone was handing me CDs with information on them to check out.
Addonics has a new external optical Blu-ray drive that has both eSATA and USB connectivity. The Blu-ray drive can play Blu-ray movies and burn CDs and DVDs. The drive is also available in a DVD only version that can burn and play DVDs or CDs.