I was talking to one of our reseller partners about licensing for SQL Server at coffee at an event yesterday. He mentioned a bid he was involved in where a college was under the impression that SQL Server needed to be licensed for each core on the server. Of course the reality is that if you decide to opt for CPU licensing then you license per chip irrespective of how many cores that chip has on it (check this site) . So if that college had two four way Intel Xeons that they wanted to put SQL Server on then they would need two CPU licenses not the eight that they thought they would need.
Which is good to know as I don’t want to have to buy 2 copies of Vista for the dual core AMD Opteron PC I use to play on at home.