Google Steet View is online for parts of the UK now. Manchester city centre works a treat. Just got to a street then grab the little yellow guy that sits on top of the scale slider, drop him on the street you want to see and hey presto, you get a blurry picture of the street. Spin the spinny thing about and you can look around you, like you were really there.
Well done Google, that's fucking brilliant. Minutes of fun.