With Microsoft's Virtual Earth beginning to compete with Google Earth there is an increasing amount of detailed geographical information available online to even the casual surfer. Google is now sweeping the streets of major European cities (and tussling with the privacy laws) in much the same way as it has done in the US for its 'street view' which is essentially photographs of every street and building, so look out for the Google vans with cameras sticking out of them! Meanwhile Microsoft's planes have been flying overhead for their "Bird's eye" view which gives unprecedented levels of detail (I can even see the broken tiles on my roof here in Galway).
Microsoft's software is of course only available to Windows users, but an increasing number of third parties (including An Post's GeoDirectory) are providing browser access and some, such as Map Channels, are even allowing you to easily display combined perspectives from both Virtual Earth and Google Earth in the same browser window.
Have a look/snoop around on their website, but in the meantime here's a simple combination of NUI Galway.