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This version of X.org and this window manager are available for anyone now, legally. Seth has step-by-step instructions on how to download and use them. So how does that count as 'catching up' to a product which we can't legally use for another, at least, year?
Er, some developers and skilled UNIX alphaware compilers being able to use things alpha, not integrated, demo of a composite manager does not count as "anyone can use it".
Tiger will retail next month, and Panther already does more of this, stably (sic) and more intergated.
Even when Longhorn gets out (2006? 2007?) this still won't be readily available for linux desktops.