What camera resolution (how many megapixels) should I buy?

As discussed in the previous posts, most people never use more than 4 megapixels of camera resolution (that equates to a 5"x7" print, that is, if they ever print their images), for most situations.  Therefore, in choosing which camera, other features (and not camera resolution) should be considered, because most cameras nowadays have much larger resolution than needed anyway.