Bitt, the keyboard is the Apple Wireless Keyboard Pro and I believe it's three generations back. It seems like you can still get it through third-party resellers. At least the US layout version. It also appears to be the only thing I've seen that actually hits every single point. Which is surprising.

Look at that... Here's a UK version on eBay UK (@ £23 plus postage):

http://cgi.ebay.co.uk/Apple-Bluetooth-Wi...c#ht_1291wt_907