Galaxy Tab, apparently. As The Wall Street Journal reports, those two million Galaxy Tabs that Samsung reported it had "sold" in the fourth quarter of last year were apparently not actual sales to consumers, but simply sales to distributors (which is a different matter altogether). Even more surprisingly, Samsung's Lee Young-hee further explained on an earnings call on Friday that so-called "sell-out" sales to customers were actually "quite small," but she wouldn't provide a specific number. Somewhat confusingly, however, she also later noted that while "sell-out wasn't as fast as we expected," Samsung still believes that sales to consumers were "quite OK," and that it is "quite optimistic" about 2011.
Update: As it turns out this was a misquote, and sales are actually "quite smooth." Full details here.