This is the site of the day on thefwa.com. It is a great flash geo navigation scheme. As someone who has done a couple flash world-navs, I think it is a great example.
One subtle touch is how it switches between low and high quality during transitions. This is a great tip for anyone doing large scale line animations. You can tell flash to switch to low quality and then do the transition. When its done, switch back to high. The line work gets a little bitmapped but I think it is a good comprimise. The alternative is that dreaded chunky animation. Chunk-a-chunk-a-chunk never looks good.
Check it out: