I Second that IrfanView emotion, it's the easiest way to go (and free!)
Capnhowdy, just drag your pic to it, choose Image -> Resize/Resample and then use 'Set new size as percentage of original.' and pick a percentage. That's the quickest way to shrink it down and keep the picture quality. Cropping is super easy as well, just click/drag to select an area of the pic you want and Crop/CTRL-Y.
I usually resize my camera pics down a bit (50%?) to view fully on the screen, crop a bit to zero in on what I want, and then resize a bit more to make it manageable for email/posting.
IrfanView rocks!