I don't know if this is common, or not.
Installing office 2007 gets me a consistent 20-30% increase in Explorer's CPU. according to process explorer, even when the computer is iddle, the process is taking 1/4th of the CPU!
I know that Office 2007 was supposed to be a resource hog, but this is explorer itself. I think this is the only new application I have installed. It's probably worth it, but I'm sure my batteries are going to last very little. If this is normal behavior, we better start carrying a car battery with us and the laptop...
Have you experienced anything similar?