Tesco are currently allowing you to "top-up" your clubcard points by paying extra funds into your clubcard account at the till.
WHY is this a good idea? Well, Tesco have a catalogue - both online and in-store which has "deals" in it. Basically the clubcard vouchers you get are worth up to x4 cash value if used via the clubcard deals.
Example: pay in £100 and get £400 off the price of your holiday
The deals cover all sorts of areas; RAC, Alton Towers, Blockbuster, flights, eating out - so take your pick.
Basically its far better to buy using the vouchers rather than just cashing them in at Tesco since you get x4 the value, but obviously it needs to basically be something you going to buy anyway. But for those of you already thinking about your 2008 holiday - how do you fancy it for 1/4 of the normal price!