Google Maps
The Future of the Google Maps API
Nobody knows the future of the Google Maps API. Today it is free (in Beta) but tomorrow, who
O’Reilly points to a pessimistic and an optimistic point of view
Google Maps Mania
Google Map Hacks
Using Google Maps in Real-Estate
For Developers
Google API Docs
How to embed a Google Map viewer on your website
How to Hack Google
Google Maps on your website
Google Maps Embedding How-To
Google Maps Hacking Wiki
Where’s Tim Hibbard? – Help connecting up to Google Maps & Google Earth
How to draw a circle around a waypoint
Gnikville Wiki
There are several sites that will provide longitude/latitude for a given address. Just search on "geocoding" and you’ll get plenty of hits. Some sites offer an API allowing free access up to a certain number of requests, after that you would have to pay.