On Wed, 7 Jan 2009 07:58:04 -0800 (PST), hank
wrote:

I would recommend against sanding the jamb as you mentioned. Putting a
long straight edge against the jamb on both sides are there any gaps,
trying to see if door frame is installed properly.

I agree. Reshaping a jamb is asking for trouble down the road. The
jamb should be plumb and the top absolutely level else you might curse
it everytime you use it, or try to use it.