I'd mentioned Amazon's foray into maps earlier, but they've gone even farther and launched http://maps.a9.com with "BlockView Images" for a bunch of cities. It's very Ajax-esque and while I think the dragging of the magnifying glass could use some work (I keep expecting it to work like Google Maps) it's a pretty interesting concept.
UPDATED: This is cool, adding A9 images to Google Maps.
Here's the lay of the land as I see it.
Interesting Map Sites
Amazing Map Fat Clients
GPS Map Clients with DVDs
Map Sites That No Longer Serve a Purpose
Map Sites That Totally Missed The Boat But Are Still Used As Verbs
Map Sites That Should Have Been Integrated with Another Map Site But Aren't For Whatever Reason I'm Not Privy Too But That's Still No Excuse
Scott at DevReach in Bulgaria in October
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