Nokia N900 Support line on 08450455555, guy called Alan who works there. Apparently the same is going to happen in Russia but not the USA yet as there is not a network that wants to align with it he said.
nokia's push email is pretty poor compared to Blackberry. Quite often you get delays to emails being pushed. If the idea is to start charging people for this then they are dreaming. Not many would pay for something that others are offering for free and formuch better.