Netbook Games - Another consideration

As a follow on to my last post, another important consideration is the fact that netbooks don't come with optical drives by default. Consequently, the ideal netbook game doesn't require a CD/DVD in order to play - this restricts games even further as most games uses the disc in the drive as a means of copyright protection. This means the game has to be either DRM free (e.g. Puzzle Quest, Galatic Civilizations) or an online only game (e.g. Steam, Flash-based games, etc.)