I'm addicted to Google Earth at the minute! It is behind, probably by a couple of years, but I still love taking a stroll around POP from my living room lol.
Live Maps is brilliant, we (Johnny is my husband) have been using it for years.
To be honest whilst we have viewed WDW and Universal, it really has helped us more in searching for a villa.
Being able to view the actual home and see whether it's south facing for example is just great.
It's also good to be able to follow roads or highways, we have planned a trip to Clearwater and have followed the route to the beach from a mall in Tampa we are planning to stop at.
Live Maps really is excellent.
One tip it really is better if you have the post or zip code you are searching on, I would always recommend you have the full address.
NB
*Johnny can still be found on the DIS occasionally, think he tends to just post on the disABILITIES forum now, hence I have my own account now*