I regularly work remotely at coffeeshops with my laptops and get a lot of questions about my portable ergonomic setup. Here's a list of the components I use:
2. Goldtouch Go! Travel Keyboard Aluminum - The split keyboard allows for a more natural wrist and shoulder position. I just wish it was slightly smaller, Bluetooth Wireless and had better keyboard layout for Mac users.
3. Apple Magic Mouse - Super graceful scrolling reduces strain.