Google Maps has a new option called ‘Earth’. http://maps.google.co.uk/
This is a hybrid between Google Earth and Google Maps but the most significant feature is that the satellite images are newer and appear to be at a higher resolution.
I have just spent a wee while counting feannagan (lazy-beds) on Lewis!
I only came across this option today but initial impressions are that it represents a significant advance.
If Google add Grid References and OS Mapping, they’ll meet most of my online mapping needs (the exception being old OS mapping that is currently only available at http://www.old-maps.co.uk/index.html )
This provides the ability to switch between OS, modern, terrain and satellite maps AT THE SAME SCALE. The last time I saw this was on an earlier version of the ‘old-maps’ site, but this looks vastly superior – it is fab!