The PS3 is undeniably making a comeback, but despite this Microsoft still managed to sell slightly more consoles than Sony over the last twelve months, not many more though to be fair.
As for the PS3 outselling the Wii? Maybe, in the far future, but the Wii has a massive head start.
I've even brought a graph:
Aside from January, the Wii has consistently sold over 100,000 units every month and in some months over 200,000 units. The PS3, by contrast, peaked at 150,000 in December and has averaged at 50,000 every month after that.
As other people have mentioned, the Wii does not have a fantastic catalogue of exclusives to draw on, but a low price point, an emphasis on family fun in their advertising and a readily accessible control scheme means that it sells to demographics that Sony and Microsoft can't touch, not without a significant shift in focus anyway, which incidentally, we are seeing Microsoft do now.