The Register Hardware has a preview of the Intel Core 2 Duo processor:
Intel was keen to highlight some of the new functions of the Core 2 Duo processors. First of all there will be versions with either 2 or 4MB of shared cache - ot Intel Advanced Smart Cache, if you're into marketing wording. The two cores have to "fight" between themselves for cache allocation, and Intel claimed this technique delivered the best performance in their simulations.
One of the most important features is what Intel refers to as Wide Dynamic Execution, which allows for more data to be processed per clock cycle compared to previous generation of products..