Varun over at CTZ has put up a seven page article on the confusion that is Intel's naming scheme & roadmap. If you're curious about either, he's got it all down over there, so check it out.

"Gone are the days when processor names were something as simple as their clock speeds. If you wanted a nice and powerful 3GHz processor, you simply asked for a P4 3.0GHz and that was it. Ever since Intel has decided to revamp its naming conventions, the confusion makes you wonder if the whole idea of renaming was a smart move."