Review: Anker Ultra Slim Mini Bluetooth 3.0 Wireless Keyboard
tl;dr: A great (and very inexpensive) alternative to an Apple-branded keyboard. You get what you pay for, and a little more.
Ever since Apple introduced its first 'chicklet-style' keyboards on laptops, I've been a fan. I love the feel of a loudly-clacking Apple Extended Keyboard II, but I can type much faster and more accurately on Apple's newer keyboards, like the $69 Apple Bluetooth Keyboard. I also like the compact footprint and durability of the aluminum-bodied keyboards, even with the larger Apple USB Keyboard with Numeric Keypad ($49).
