Norton is not giving out Norton 360 and Norton Anti Virus 2010 free download for 90 days. There are lot of significant improvement in the speed and technology in the Norton 2010 version. In the earlier days Norton were known to slow down your PC. According to Norton they have built 2010 version security products from the ground up and highly optimized for Windows 7.
Norton 2010 security versions are lightest and take little foot print in the memory. I am using this on one of my PC and speed is significantly improved in comparison to previous versions.