I may have found exactly what I'm after on Amazon though (thanks JAT for the suggestion). It's called the Acoustic Research ARi3G, and it's basically the Apple remote with volume, power and source select buttons. And it comes pre-programmed for the Apple TV as a bonus. I found one on eBay for $20 (Amazon doesn't ship to here). I'll report back when it arrives.
I was going to mention that one. Here's
a link for it. Only $11 and it's definitely simple. Backlit buttons, too. I was thinking about buying one just for fun. Let us know what you think.
For me, I kinda need a bit more functionality because I also have a Windows Media Center computer (as my DVR) in my bedroom and XBox 360s as Media Center Extenders in other rooms, so I bought a few Logitech Harmony 650's a while back when there was a good deal on them. But they've got *way* too many buttons on them.
If Apple could score some sort of deal with the major networks whereby I could drop my cable subscription, I'd love to have just an AppleTV and could then get by with a simple remote and single UI.
Remember that the ATV can *learn* the signals from any remote control (a very cool feature). I used to be a long-time TiVo user and, despite the lack of backlit buttons, my family could all operate the remote without looking. It's not slim and tiny, but it feels good in the hand and I'd certainly recommend it.
That said, considering how many ATVs have been sold, you'd think we'd see more beautifully designed, simple and small, 3rd party remotes.