Ok,
Quite often some of like to point out how well the PS3 is doing in comparison to the PS2/1 using this graph.
http://vgchartz.com/hwcomps.php?cons1=PS®1=All&cons2=PS2®2=All&cons3=PS3®3=All&align=1
Please stop...idiots.
If you notice this site has no data for PS1 sales in NA or Others.
http://vgchartz.com/hwcomps.php?cons1=PS®1=Japan&cons2=PS®2=America&cons3=PS®3=Total+Other&align=1
Also notice that this site has no data for PS2 sales in Others.
So, all you are really doing is comparing the worldwide sales of the PS3 to one region of sales for the PS1 and two regions of sales for the PS2(or one region when you set PS2 to 'All' as it was only available in Japan at this time).
What is really nice is looking at this graph shows that the PS2 sold nearly as well in either Americas or Japan as the PS3 did worldwide.
http://vgchartz.com/hwcomps.php?cons1=PS2®1=Japan&cons2=PS2®2=America&cons3=PS3®3=All&align=1