$130 wireless touchscreen hacking platform from Kodak
amzn.com
amzn.com
A lot of restaurant POS systems would fit nicely on such a device. For that purpose, you don't even need to have them battery powered. Just make each waitperson's "login" very rapid. (4 digit PIN?) Scatter these things throughout the place.
There's some nice demo/sales potential, in that it looks a faux iPad. If it's nice close up, then that is one advantage.
Also, there are plenty of touchscreen kits that don't require taking things apart and figuring out your own operating system.
Part of the fun!
In any case, if entire systems this capable are end-consumer commodity items for only $129 now, that fact alone is interesting. It's only a matter of time before someone has a platform at this price point capable of supporting a browser-centric system. For $129, I think a lot of DIY folks would be willing to forgo multitouch and be tethered by a thin power cord while on the couch.
http://boingboing.net/2010/01/06/kodak-picture-frame.html
This has serious repercussions on the notion of iPad as an industrial equipment control device:
http://news.ycombinator.com/item?id=1160975
It has wireless. It's 1/4th the price, and while the touchscreen might not be as capable, it's probably good enough.
The nice thing about them is that you can get right to application development without inventing your own OS.
Archos has questionable quality reputation, and I don't know anything about the other device, so buyer beware.
(And a special thanks to Amazon for that special discount that can only be shown in a shopping cart. Sorry, that $1.18 didn't make you competitive, even with my prepaid Prime shipping. On the other hand, Provantage doesn't really have any of these and is going to go looking for them, so they may fail.)