When I was trying to decided which Mac to buy, screen size was one of my main issues. MacBook's only have a 13" screen while the MacBook Pro's can have either a 15" or a 17" screen. In the end I decided that the regular MacBook would be just fine for me, and since I now have an unused 19" monitor laying around I thought I could put it to good use.
So when I have the MB hooked up at my desk, I've got almost a desktop scenario setup: wireless keyboard/mouse, and a separate monitor.
Anyone know how I can only use my external display?