I was looking for a wireless keyboard without function keys, so that it would be small enough to lie in my lap. Here's what I found.
MacAlly make an infra-red keyboard with built-in pointing device for around 50 dollars: the iWebKey. There are no drivers for OS X, but the iMediaKey driver works, except that the special function keys don't do anything.
The infra-red reception works well, even if I kept the keyboard under strange angles.
However, the keys feel mushy, the pointing device is extremely hard to use for detailed positioning, and worst of all, sometimes key strokes are dropped, other times keys seem to get stuck. I've found reviews that state the same.
IBM makes a beautiful keyboard, the Wireless Navigator, which is unfortunately PC only. No idea if it can work with a Mac.
Gyration's web site draws all your attention to their 250 dollar, 100-feet range, product. However, they also make a 100 dollar, only-25-feet range, version of the Ultra Optical Suite, which has both a mouse and keyboard. I found it in a display at Staples.
Do not be confused by the name: the mouse is optical, but keyboard and mouse connect by radio, so line of sight is not important.
This is clearly a PC product, including the Windows key. However, stick it in a USB port, and it uses the plain Mac keyboard drivers, no installation required. The mouse works: the right mouse button behaves like a control-click. The keyboard works fine: the windows key is a command-key, the alt key is option (unfortunately it's to the right of the command), and control works fine. The keys also feel good to the touch. Unfortunately this keyboard also occasionally drops a key. This seems to be a problem with the Mac looking the other way, and the keyboard not buffering. Or something.
Victor Eijkhout, December 2002