No one knows how may Ps3's sony shipped. But atleast they are doing Weekly drop shipments.
Nintendo announced they shipped 600k Wii's at launch.
Ps3 demand has waned becuase of the lack of supply, so people/parents gave up searching.
A target store might get 5 PS3's and 50 Wii's.
They will both sell out within minutes.
But again parents would rather buy the Wii becuase its cheaper and somewhat easier to find.
You probably wont see PS3 numbers picking up untill mid/end of next year where supply is equal to or greater than demand and when games like MGS4 come out.
I think the following PS3 titles come in 2007:
-Devil May Cry 4
-Metal Gear Solid 4
-Final Fantasy XIII
-Gran Turismo 5
-Virtua Fighter 5
For Wii we have:
-Metroid Prime 3
-Super Smash Brawl
-Battalion Wars II
Thats all I can think of from the top of my head, I just listed exlusive titles.
I know Mass Effect, Bioshock, and Alan Wake are comming out for 360, but they are also comming out for PC.