For Europe, I use www.multimap.com -- for example, here is an image that I chose at random from Slovakia:
http://www.multimap.co.uk/map/browse.cgi?client=public& overviewmap=SK_over&db=SK&scale=1000000&coordsys=& g.x=81&g.y=154

Multimap's coverage of the UK is particularly outstanding -- you can even have it superimpose a map image over an aerial photograph of the same area at the same scale as the map.

For the United States, I LOVE Terraserver. It has maps and aerial photographs from the United States Geological Survey. For example, here is an aerial photograph of a portion of the terminal building at SFO:
http://terraserver.homeadvisor.msn.c...0&y=20818&z=10

This site tiles the photographs together at whatever resolution you want in order to show you almost any area of the country you want. Like I said, they also have USGS topographic maps for the entire country, again at your choice of resolution. By clicking on Advanced Find, you can enter a street address. This allows you to bring up an aerial photograph of where you live or work, or almost any other place of interest in the United States.

For street-level finding maps in a city or for driving directions, Mapquest or some other site that generates maps on the fly from a database is better, but otherwise Terraserver and sites like it that use scanned images of paper maps provides superior results, IMHO. Here is an example of a randomly pick Maui, Hawaii, map. You can zoom in or out and pan to whatever portion of the map you want.
http://terraserver.homeadvisor.msn.c...&y=356&z=5&w=2


[This message has been edited by amanuensis (edited 01-11-2003).]