Now, to the pictures:
You can visit the falls from both Brazil and Argentina (they are right on the border). We did both, but if you ever visit, I don't really see a reason to spend the money on the Brazil side. The Argentina side is much better. Here is a shot from Brazil, though, which does have a couple nice panaromic viewpoints.
A shot of a completely different section of the falls from Brazil. Everytime you think you have seen them all, you walk around a curve in the path and see more.
One last comment. I almost called this post "Water, water everywhere, and not a drop to drink". It is amazing that among this much water, they have no waterfountains. Restrooms every 10 feet, but you have to buy water if you want (not drinkable straight from the tap). We don't take our water filter on day trips like this. So, if you visit the falls, take plenty of water or be prepared to overpay for it.