Since Crazzy got banned, and I missed the weekly updates, I decided to go back and check the numbers (since adjustments have been made) and post them. No need to thank me Crazzy!
January-February-March.
PS2 numbers (2001)
PS3 numbers (2008)
PS2 January 07th - PS3 January 06th
USA - 80k <> USA - 77k
Japan - 87k <> Japan - 68k
Others - 80k <> Others - 151k
Total - 247k <> Total - 296k
PS2 vs PS3 = +49k
PS2 January 14th - PS3 January 13th
USA - 64k <> USA - 57k
Japan - 32k <> Japan - 37k
Others - 53k <> Others - 82k
Total - 150k <> Total - 176k
PS2 vs PS3 = +75k
PS2 January 21th - PS3 January 20th
USA - 60k <> USA - 54k
Japan - 26k <> Japan - 36k
Others - 50k <> Others - 80k
Total - 136k <> Total - 170k
PS2 vs PS3 = +109k
PS2 January 28th - PS3 January 27th
USA - 67k <> USA - 61k
Japan - 49k <> Japan - 32k
Others - 61k <> Others - 89k
Total - 177k <> Total - 182k
*Rumour of PS3 pricecut in USA.* Proved false
PS2 vs PS3 = +114k
PS2 February 04th - PS3 February 03rd
USA - 66k <> USA - 67k
Japan - 56k <> Japan - 40k
Others - 63k <> Others - 85k
Total - 185k <> Total - 192k
PS2 vs PS3 = +121k
PS2 February 11th - PS3 February 10th
USA - 52k <> USA - 73k
Japan - 51k <> Japan - 23k
Others - 63k <> Others - 92k
Total - 166k <> Total - 188k
PS2 vs PS3 = +143k
PS2 February 18th - PS3 February 17th
USA - 57k <> USA - 77k
Japan - 44k <> Japan - 18k
Others - 62k <> Others - 84k
Total - 163k <> Total - 179k
PS2 vs PS3 = +159k
PS2 February 25th - PS3 February 24th
USA - 86k <> USA - 90k
Japan - 43k <> Japan - 14k
Others - 60k <> Others - 78k
Total - 188k <> Total - 182k
PS2 vs PS3 = +153k
PS2 March 04th - PS3 March 02nd
USA - 104k <> USA - 86k
Japan - 42k <> Japan - 14k
Others - 67k <> Others - 74k
Total - 213k <> Total - 174k
PS2 vs PS3 = +114k
PS2 March 11th - PS3 March 09th
USA - 125k <> USA - 67k
Japan - 54k <> Japan - 22k
Others - 72k <> Others - 74k
Total - 251k <> Total - 163k
PS2 vs PS3 = +26k
PS2 March 18th - PS3 March 15th
USA - 127k <> USA - 64k
Japan - 48k <> Japan - (not yet in) estimated 20k
Others - 70k <> Others - 71k
Total - 245k <> Total - 155k
PS2 vs PS3 = -64k
For the first time this year, the PS2 has sold more than the PS3 has. Depending on how the PS3 does from now until GTA4 launch, the PS3 might overtake the PS2 again the week of and after GTA4, but then after that I'm expecting the PS2 to stay ahead of the PS3 from then on, with the PS2 ending the year with 16 million sales, and the PS3 ending with around 12 million for the year.
For reference here is the table for cumulative sales for the PS2, and here for the PS3 (in 2001 and 2008 respectively, Jan through March only). The difference between those numbers is 85k or so, and its missing Japan data for the current week, which should be about 20k, which makes the numbers very close (meaning hopefully they are all right).