Hilton has several websites outside of Hilton.com featuring region specific sales or weekend deals. For those that travel in the Asia Pacific region, should check out the Asia Pacific sales website.
Although the website is Hiltonhoteldeals.com, it is merely used as a skin and the actual booking is done on Hilton.com. The presentation of hotels and region specific deals on this site is better, however.
Here are the current sales:
The website for the Asia-Pacific hotels has a nice layout and clearly spells out the sales going in the region. Worth checking every once in a while.