Great shots Cre@te!
sue - the big problem with most of those cheap wide-angle/telephoto lenses is the quality of the glass/lens. Sometimes they degrade the image pretty badly - purple fringing [known as chromatic abberation], decreased contrast, and vignetting. But sometimes they don't or at least you can work within the lens limitations. For $25 (which is the price of the Canon adapter alone) it might be worth a shot. (Looks like they have a 7 day return policy w/ a 15% restocking fee if you're not happy).
I'm actually in the market for a wide angle adapter for my A720IS so I may give these guys a shot. (I already have a 58mm wide angle add on lens which I know is pretty high quality so I really just need the adapter, but like I said, with these lenses you never know until you try them how good/bad they might be.) But as Cre@te's pics show, you don't need add on lenses to take great pics with the A720IS. And rarely will the image quality actually be better with an add on lens. The add on lenses just give you more options, e.g., wide angle, super telephoto shooting (BTW - I suspect the filters they're including won't be any good for anything.)