Maplin have RF MCE Keyboard with Built-in touchpad for 30 quid (£29.99) - UPDATE BACK IN STOCK as of 2nd April 2009 but now £49.99
Recently when asked what wireless keyboard I would recommend for Media Center use I have been mentioning the RK-278 MCE Keyboard from Maplin here in the UK. I really like these keyboards they have a good full size keyboard which balances nicely on your lap; a good selection of media center specific keys and most significantly a built-in touchpad. For those of us using Laptops day in day out this is just so much easier to get on with than the joysticks or trackballs that usually inhabit these al in one input devices. So even though they retailed at around 60 quid I thought the extra functionality worthwhile over other cheaper competitors. Now, in time for the holidays, Maplin have dropped the price to just under 30 quid - which is a bargain.
I think this offer is in store only as i can't find the keyboard listed on the website and my local store did not have many left.They also currently have a rather neat RF based Media Center remote for sub 20 pound as well. CORRECTION: this is actually an infraed remote not RF (I'm sure it said RF on the shelf)