Conclusion: If you're picky about your keyboards, the Logitech diNovo Keyboard for Mac has plenty to offer, including programmable hot keys, but if you're not so particular, you can get a comparable device for less.
Pros: Spacious palm rest. Matches the Mac aesthetic. Impressive wireless range. Programmable function keys. Works without loading included software.
Cons: Tricky to sync the first time. Expensive. Receiver takes up USB port.
Conclusion: The diNovo range on the PC is a very good and one that works well, however ported over to the Mac and put up against the standard Apple keyboard both wireless and wired it's not as small or comfortable. Add that to the fact that the Logitech offering is £20 more expensive and we can't see why you would bother.