Not sure when they where added, The earliest I've found is Sunday, but nobody's mentioned it yet (as far as I can see). You reviews also get added to the page found on Tuesday [ blogoscoped.com/archive/2006-1 ...]
Just go to a model and click ratings and reviews.
Model [ sketchup.google.com/3dwarehous ...]
Reviews Page [ sketchup.google.com/3dwarehous ...]

Some weeks ago there was an update of 3D Warehouse, but I don't remember if this was already there...

but the WII controler model is really nice :)

Are you refering to this [ blogoscoped.com/archive/2006-0 ...] ?
The only updates here are how "complex" the models are and a location if there is one, I think the ratings have been launched with in the last week.

You're right, so good pick MISTER Mrrix32 ^^