The five of us—plus two Norwegians—went to the falls yesterday. We took a boat ride on the Lower Iguazu—that's the river after the falls—and actually drove (does one drive a boat?) under the falls. It was very hot out, so that cooled us off nicely—and pummeled our faces with stinging high-speed droplets of water.
We were there during the middle of the day and there are constraints on where you can walk, besides the crowds everywhere, so the pictures I got are underwhelming, but a bit of fun. I took advantage of the underwater case for my Panasonic TZ-3. It worked nicely.