I remember about two years ago, before a trip across the Atlantic, trying
to find websites that had street maps for London and Dublin -- and coming
up nearly empty.
Now, a year after it became available, I notice that Google Maps
covers Ireland and the UK.
Unfortunately, it does a piss-poor job of finding locations:
try typing anything more specific than Dublin into the search box.
Google Maps now provides a basic ability to get directions
between cities.
Some other map links: