No disrespect to joshu (who is around), but I never had a single non-techie friend who used delicious. For whatever reason, only reddit (and to a lesser extent Digg) have been able to break out of the geek echo chamber when it comes to social news. Slashdot, which had a 6-10 year jump on all of them, never could do it either.

Maybe it's the .com. Who knows.