Virtual Earth and Google Maps both do nice things like show where your IP address is (although Virtual Earth just showed the general southern England region when I tried the IP address locator, so I'm not overcome with excitement) but these new mapping sites are strangely useless for various simple tasks that some might say maps are more commonly used for.
For example, Virtual Earth has no roads marked in the UK! And although Google Maps has roads marked on it, they decided not to include motorway exits. So if I ever have to use an online map, I go back to good old Multimap.co.uk. It does really fancy things, like... um... show you how to get places.
I think that the new mapping sites were designed for people that don't leave their PCs!