** NOTE ** Mine didn't come with the USB charging cable or a box (just the unit itself) the charging cable is a standard mini-USB cable, so the one you use to charge PS3 controllers will work just fine.
Missed the deal earlier today for £12.95, looked it up on CEX this afternoon and got one from the Camden branch. Good if you have some store credit at CEX (like I did!)
It has a mouse built in too (the entire keyboard adds as a trackpad), and apparently can be paired up with a PC, so might make a good HTPC remote? Video here: http://www.youtube.com/watch?v=aFQoqreZ8cw
Direct Link: http://uk.webuy.com/product.php?sku=SPS3WIRE001
Description from Playstation.com:
Wave goodbye to unnecessary tangle-ups with this handy accessory for PS3.
- Enjoy text chat from the comfort of your sofa with the Wireless Keypad for PS3.
- Attach the Wireless Keypad to the top of your Wireless Controller for the ultimate Wireless experience.
- Chat in-game and via PlayStation Network, or browse the web quickly, easily in touch pad mode.
To use the Wireless Keypad, the PS3 system software must be version 2.50 or later.