Dual Maps from mapchannels.com enables users to embed Google maps and Microsoft Virtual Earth side by side
This new feature comes to us from MapChannels - It is now possible to create an embeddable map that includes an aerial map, a bird's eye view and a street view of the same location. You can change the settings of your Dual Maps without having to re-visit the Map Channels website. The service is free and does not require registration.
A custom setup screen enables users to first set display option such as map style (is terrain, or street view, borders, Virtual earth options, toolbars, and marker titles... quite nice! Create your own dual map here
See below for a sample DualMap
Map Channels - Free mapping tools for your website or blog