An interesting site that XV277 posted a link to. One thing to be aware of though. Some of the pictures supplies by Microsoft Virtual Earth are seriously out of date.
My House - No extension (at least 5 years ago)
The one of mine (just off one of the 'airfields') is at least 7 years old because I know when they were taken! Most of the high-ish definition stuff is from Get Mapping's Millenium map, and was taken in 1999