Since there many other people are blogging the details of Where, I'm just going to take notes about the ideas that resonate with me...

Make your maps permalink friendly: Everyblock.com has a Uri hierarchy (RESTy?) that makes sense, and allows deep-linking and deep-search.

Need to do more than points: deal with "areas" - neighborhoods, routes etc. Especially relevant for geo-locating events/stories, where push-pins over simplify. The situation.

Roll your own maps: make the map relevant for your users. Don't show what you don't need. Control the look & feel of the cartography and make it part of the site design.

Federated Geodata: (Sean Gorman) someone other than ESRI talking about breaking data out of the silos. Not much detail on the "how", or synchronizing updates, but maybe he'll post more details.

GOOG & ESRI: Enabling data sharing / deep indexing. Good demos of ArcGIS Server analysis fronted by a consumer UI experience - geoprocessing in Google Earth. The "real" application were a change of pace - not that "my friend recommends the calamari at this place" isn't useful, but real-time forest fire modeling / evacuation planning just has a little more "bite" to it. 

Overall, an interesting morning. The John Hanke and Jack Dangermond session certainly got people talking - and that's always a good thing.  Should be interesting to see how many groups open up their ArcGIS Server 9.3 systems to Google's indexing. Discovering data that's been walled off for so long could be really interesting.

More later...