PS3 (should) have lots of 3rd-party support coming. The difference is, Sony is quite happy to keep quiet about these games until they are ready for exposure/release. They will also (on average) be much bigger titles than are released on the Wii.
During the last couple of years of PS2 domination, studios have been busy talking/planning with Sony about potential PS3 titles. What has surprised me, is that more haven't been readied for release.
You'll see a trickle turn into a flood (in 1-2 years time). The question is, what state all three consoles will be in by then. Sony has a risk of scaring some of these studios off (and turning them into 360 or even Wii titles) if they aren't careful.
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