Crazzy, in NO WAY are both of those years the 2nd year for each console.
If you talk year to year, the PS3 was launched in 2006, so 2008 is it's 3rd year. compared to PS2s 2nd year.
If you talk your odd "released worldwide" thing as you were at the beginning then both are the first full calendar years for each console... but that's the problem, PS2 was barely released at the beginning of it's first full calendar year, wheras PS3 has had more than a year in 2 regions and almost a year in Europe.
In otherwords your analysis hangs on the fact that the year lies as it does, and you are lucky that the PS2 completed it's roll out to the world just before Christmas, wheras the PS3 was delayed in Europe for 3 months into the year.
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And no it is not useful to anyone who wishes to make a worthwhile comparison, PS3 fan or not.... Should someone deluded enough wish to use this to predict the future PS3 sales they will fail miserably.
