First, Japan:
This is easily the most startling graph, as it shows not only that the 360 has already surpassed the original Xbox's LTD, but also that it's curve works in the opposite direction: the original Xbox sold reasonably well at first and then died off, while the 360 started dead and has picked up (a tiny bit) of steam.
Now, the least impressive graph. it appears the Xbox brand has made little headway overall in other regions beyond its predecessor. With that said, sales for the Xbox were okay to begin with, so it's not terrible, but based both on the oscillating comparisons with the original Xbox and the decreasing marketshare the 360 has seen in the EU the last month, it doesn't look like the 360 is going to pull significantly away from its predecessor in this region.
This chart is less startling but perhaps more impressive than the Japanese one. Note how the 360 was mimicing the original Xbox's sales for some time, but has recently begun to pull significantly away from its predecessor. This is also true worldwide:
http://vgchartz.com/hwlaunch.php?cons1=X360®1=All&cons2=XB®2=All&cons3=X360®3=All&weeks=156
I believe we have reached the timeframe where last generation saw the success of the PS2 smothering the sales of its competitors; clearly, that isn't happening to the 360 this time around.
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">







