This is a '2 for the price of 1' offer for hotels from the Intercontinental Group, IE: Holiday Inn, Express by Holiday Inn, Intercontinental, Crown Plaza, etc, and covers hotels from the UK and worldwide.
A similar offer was posted on here about three weeks, but I'm not sure the deal got the credit it deserved and the offer seems to have been extended beyond the original expiry date (Even though the website still says the offer expires on 31st Dec, I've just confirmed a booking for Feb 09).
The great thing about these hotels is that in most cases you can get rooms for upto 4 people which is great for families, there is a good buffet breakfast and in many cases, swimming pools, saunas and health clubs on site.
The best deal I have found is for £19.50 per room per night with breakfast for upto four people, absolute bargain and a much more pleasureable experience than Travelodge, Premier Inn etc.
EDIT: I HAVE CHANGED THE TITLE TO SHOW THE 'PER ROOM PER NIGHT' TOTAL AND ADDED THE FOLLOWING EXAMPLES (PER NIGHT RATE PER ROOM FOR WEEKEND 21ST NOV, AS AN EXAMPLE)
£24.50 Burton Upon Trent
£24.50 Luton South
£24.50 Hemel Hempsted
£25.00 High Wycombe
£27.50 Birmingham M6