Nice, Derrick Oien just posted the news that Cyworld US looks like it's going to launch next week. Their about page is up and has a date of April 2nd as when their "minihomes" make their US market debut. Of course, it was written in past-tense, so you never know if some over-anxious marketer got a hold of the page text and pre-announced a date without checking with the engineers... but from what I've seen, they're pretty close to being done.
Marc Canter should have the scoop on this - check his post about them if you don't understand why Cyworld is a Big Thing(TM). It'll be *really* interesting to see if they take off here.