The Nikon instant rebate program got extended again in the US till January 29th, 2011 and is pretty much unchanged from last month: up to $400 savings per lens when purchased with qualifying Nikon DSLR body (multiple lens rebates CAN be combined with the purchase of one qualifying Nikon DSLR body). Previous reports indicated that the rebates may be discontinued in January of 2011. The Nikon rebate program started on March 1st, 2010.
FYI: Tamron lens rebates were also extended.