Keyboard and Mouse wireless set, black:
The most reliable way to go cordless.
This wireless desktop set from Logitech combines a cordless, spill-resistant keyboard and an optical, scroll wheel mouse. The set comes with a five year guarantee and will connect to your pc via either a PS/2 or USB connection.
PC World are doing this for £19.56 in-store, whereas Staples online is showing as £19.99, it was less than £15 in-store at the Staples Corner store (Brent Cross).
I bought it, works fine on Vista, good deal. Not sure when it expires.