Travel Accessories

I am new to the wonderful word of notebook/laptop computers, and I would like to know what are your favorite travel accessories, which ones are worth the money and which ones to avoid. I have been looking at the various accessories availible on the market and their are so many, I know that I want to get a USB light and a cable lock to secure my laptop when I leave it in my hotel room, but I don't want to waste my money on junk, so please give me the benefit of your experence.

Mom H.