I am planning on getting a MBA w/ 1.8ghz processor and the 80gb HDD. I have a bunch of DVDs ripped onto my computer that I like to watch while traveling. Do you guys think that with all wireless off and screen half to full brightness, I will be able to watch 2 full DVDs [4.5 hours of DVD watching....let's call it 5 hours of total usage]. I am asking because I know Apple, and almost all computer manufacturers, tend to overrate useful battery life. Nonetheless, the 5 hour claim seems to be 5 hours while surfing the net. Hmmmm. Any thoughts?