<A HREF="http://hp.vector.co.jp/authors/VA002374/src/download.html" target="_new">WCPUID</A> will have a pull down box labled "Processor #1" pull it down and if you see "Processor #2" then your machine is seeing both CPU's.
You can also <A HREF="http://www.sisoftware.co.uk/index.php?location=sware_dl" target="_new">download Sandra Benchmark</A> and look the the results, you should see SMP enabled in the CPU tests.
<b>"Granted I dont own a P4. But I read enough stuff and waste enough time on forums newsgroups IRC and computer news sites that I proberly know more then if I DID own a P4." -vk2amv</b>