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Haven't had time to explore these sites, let alone play with their offerings, so this is just a note for future reference. Both are mentioned at Google Maps Mania, and both are applications that require some sort of download; a Google API for one, and an executable for the other.
The first is interesting because it looks like a tool for re-conceptualising road navigation as a 3D contextual array, just like one of my all-time favorite webtools, the Plumb Design visual thesaurus.
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The second one looks like a fun graphical tool, that can, for example, turn Moseley into a world of its own.
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(via)