I've never used it, but apparently it puts the harvest stats in a graphical form. If you don't want to dig through the cryptic harvest stats manually, then this CD will help you out. Considering you were looking for a unit to hunt, it might not be a bad idea.
If you're lucky enough to be on private land and can leave your stand up during the off season you can tie an old piece of cloth or something of the sort to your stand. I like to use an old camo bandana that I have. That way the deer get used to the movement and eventually don't bother even looking up when there is slight movement. This may just give you the time to draw your bow or raise your gun without being detected.