Get an extra battery. Then you don't have to worry about car chargers or anything. Extra battery should give you about 8 hours total use. DOn't buy a leather case. May sound dumb, but leather catches eyes more than a regular nylon case, and it may help you hold onto your laptop longer if you travel quite a bit. Other than those two items, I didn't really buy much else. I keep a mouse with me just in case I am able to sit down at a desk. Wireless modem maybe? Oops, the biggest necessity is DVD's (assuming you have a DVD drive). I think I spend more time watching moveis on my laptop then working. I always carried an s-video to rca adapter, and a miniplug to rca audio so when I was in hotels I could watch dvd's on the tv's.