Within a month of two the first 45nm Penryn processors will hit the market, in 2008 this chip will be succeeded by Nehalem and in 2009 we can expect a processor called Westmere.
Westmere will be a 32nm shrink of the Nehalem architecture with some new technologies such as the AES-NI instruction set which will accelerate AES encryption and decryption by up to 300%.
Intel also shared some details about Sandy Bridge - this 32nm processor will introduce a different architecture again somewhere in 2010.