There has been some good debate for the pros and cons (mainly cons on the debate) of the switch from LiveMaps to Multimap for UK users today. James Senior a UK Microsoft blogger has some information about it on his blog below…
James.Random() : Live Maps switches to Multimap
There is some geo-targeting going in the mix somewhere so as a UK user you will be likely sent to the MultiMap interface by default, whether you type in http://maps.live.com or http://www.virtualearth.com !!
However if you prefer the old VirtualEarth experience you can override it using the following link http://maps.live.com/?mkt=en-us