If you've been playing with Google Earth then you might have been disappointed with the resolution of images provided, especially if you're not in urban USA. Although they have by far the best interface, other lesser-known sites may provide greater detail.
For example, in Western Australia, the Government's Department of Land Administration has for many years provided the most detailed aerial photography. You have to use an Internet Explorer-only ActiveX plug-in, but it's worth the effort if you want to see you neighbours sun-bathing (disclaimer: neighbours must be elephants).
I have been looking for a similar service to look at my old residences in the UK, but I haven't found anything yet.