Discovery News offers an online jigsaw Puzzle of the Week. You are shown the completed image (see “Diving with a whale shark” at right), and you can choose whether to turn off auto rotate in the lower left corner of the image (leaving it on is the default, which means the pieces are in their proper orientation when they are separated). Click “Begin” and then drag pieces to where you believe they belong.
Good luck! And if you want more puzzles, click (of all things) “More Puzzles.”
FYI – Andersen Library has some old-fashioned puzzles in a box too.