The Sony VPL-VW70 comes with a two year, parts and labor warranty.
Two year warranties are pretty much the standard for 1080p projectors, with some models offering three, and a few offering only one year of coverage.
Three year warranties will be found on the BenQ W20000, the Sanyo PLV-Z700 and PLV-Z3000, and the Epson Pro Cinema 7500 UB and Pro Cinema 7100 (Epson's warranty includes a replacement program), as well as a couple of high end Optoma projectors.
There are also a few one year warranties, including the Panasonic PT-AE3000U, although Panasonic is offering a 2nd year warranty, at the moment, as a free mail-in "rebate". The BenQ W5000 also comes with only one year.