Taken from Woolworths website:
But I cannot find any web reference to which newspapers the coupons are in :(
We welcome you to redeem your Coles newspaper coupon from this week’s Friday or Saturday newspaper when you shop with us this weekend (Saturday 17th and Sunday 18th December) only (excludes Tasmania). Simply bring in your Coles coupon and spend $150 in one transaction to save $10 off your groceries or spend $200 in one transaction to save $15 off your groceries. This offer excludes Liquor purchases, Wish Gift Card purchases and the purchase of smoking/tobacco related products.
*Coles coupon will be honoured at any Woolworths Supermarket (excluding Tasmania) from 17/12/11 to 18/12/11. Qualifying spend (after savings and discounts) must be spent in one transaction (no transaction splitting at point of sale), and coupon surrendered at time of purchase. Only original coupons will be accepted. Coupons that have been defaced, damaged or altered will not be accepted. Only one coupon can be used per transaction.
That's what I called 'Hijack Marketing'.