[steevdave]

No they haven't. The closest you would come would be a tegra2 which is dual core and I believe the omap4 is dual core as well. Though iirc, you can't currently use both cores in Linux. Freescale have announced the imx6 which should have quad, dual and single cores but availability won't be until q4 (though they are pushing hard to get it before then I think.) You still are currently limited with ram on an ARM machine which I think is the biggest hinderance to going in to servers. Presently almost all server software works on an ARM machine with a few exceptions like spidermonkey (so no running Launchpad) but plenty of people use them as personal servers.