Intel's had the world's first 45nm CPUs in-house since early January 2007—the first of fifteen 45nm processor products in development. With one of the biggest advancements in fundamental transistor design in 40 years, Intel's 45nm technology can deliver more than a 20 percent improvement in transistor switching speed, and reduce transistor gate leakage by over 10 fold.
Intel will debut the 45 nanometre process with the Penryn chip. Many details about Penryn appeared at the April 2007 Intel Developer Forum. Its successor is expected to be Nehalem. Important advances include the addition of new instructions (including SSE4, also known as Penryn New Instructions) and new fabrication materials (most significantly a hafnium-based dielectric).
NB: IBM have already completed a common 45 nm process platform.
Source: http://www.intel.com/technology/architecture-silicon/45nm-core2/index.htm?cid=cim:gglcorp_us_penrynk88DEs