I can see your point, but I didn't care that much. If I didn't watch WaT (well, if I didn't once upon a time - this week's was the first I've seen since March; got a lot on tape ;-}). I guess I just accepted it as part of the cross-over thing. They totally would have done it with CSI and CSI: Miami if it handn't been before Miami's official premiere.
I was more peeved that the writers didn't mingle - the CSI folk wrote Jack, and the WaT folk wrote Grissom, and in my opinion the CSI folk did a *much* better job...

When did ER and Third Watch cross-over? I don't remember that...