No Jake, I do not one of these (Sam I am). I have a big dent in my TiBook (long story) and I don't even want to pay to get that fixed. At $259 for the TouchStream MacNTouch keyboard (interesting side note - MacInTouch is the web site of a very good Macintosh new site), you would have to REALLY be spoiled to go out and spend your money. But no Jake, I would much rather spend my money on on of those new dual 2 Ghz G5s that were announced today.
But back to this touch keyboard for the 15" TiBook. That is pretty slick. One thing is for sure, it would not scratch the screen (well OK the TiBook keyboard doesn't scratch the screen but it looks like it does). That keyboard is an interesting layout, but I think it could work. I would buy it for its not-scratching-the-screen abilities myself tho. But since I do not use my TiBook nearly as much as I used to, there is no need for such expenses :-P.
