If you would like some tips with your own waterfall photography, check out the current issue of Digital Photographer magazine (issue 82). This issue's "Big Feature" is on water, and I was invited to share advice for photographing waterfalls. Among other things, you'll get the exposure settings for some of my favorite waterfall images, and you'll read about my technique for finding rainbows in waterfalls. Yes, there is a trick.
By the way, I do have a some of my 2009 Water Works calendars left. It features waterfalls, lakes, and rivers from throughout North America. While the year is well under way, the images are printed on fine-art paper, and are suitable for framing. Shipping is free.