Three rate codes to add, all advertised in the UK but not sure if any will work elsewhere:
IDEX2 - "Exclusive 3 for 2" = 3 nights for price of 2. Advertised as valid until 26/12/08 but still working into January (at least).
ISHC1 - "Promotional Leisure offer" = Bed & Breakfast from £25 per person. Advertised as valid until 1/2/09.
ISDX1 - "Promotional Dinner Offer for a two night stay" = 2 nights B&B including dinner on one night from £60 per person per package. Advertised as valid until 1/2/09.