Before fall storms come your way, you might want to spend an afternoon in the gutter... on your roof. First, clean out all the debris from the gutter. (If you own a leaf blower, there's a nifty little gutter attachment that makes the job a breeze. Ask for it at your nearest hardware store.)
Next, check for rusted-out patches and other holes in the gutter. Next, flush out the downspout with a hose. To avoid any further clogging, install leaf guards that prevent leaves and large debris from getting into the gutter. Cleaning gutters may be a lot or work, but at least you won't suddenly get gutter overflows spilling onto your sidewalks, siding or driveways.