I have used Apple Magic trackpad for almost an year and I started having severe discomfort when I my middle and ring finger are stretched. I was not resting my palm properly and that probably contributed to the issue. I switched to an evoluent mouse (http://www.amazon.com/Evoluent-VerticalMouse-Regular-Right-V...) and it got better very fast (in couple of weeks).
Frequently working with two different folders? open a new window(Ctrl+N) and dock one window on each side of the screen with win+left/right. Then simply alt+tab between them, or use the win+nr if you have it docked on your taskbar.
The only thing i'm missing for keyboard navigation is a hotkey to toggle navigation bar on/off and a more sleek autocomplete, such as visual studios or quicksilver.
- Don't use your laptop without a 'docking station' for long. Strain to your neck, back and hand/wrist. A mouse/keyboard and support to keep the screen at eye level does wonders
- Don't use a 'moving mouse'. Apple magic trackpad is great. Trackballs are great as well.
- Even better, limit the use of a pointing device (if your job allows it, e.g. for anything graphic this is difficult). Today I do most of my work with keyboard alone, even web browsing (the exception is clicking links and buttons)