Just figured that google earth has added some high resolution images of chennai. They have covered quite a large part of chennai though not all of the city. A square area from Tambaram to nungambakkam have very nice high res images. North chennai is still low res... so are areas like anna nagar and mogappair...
My house, areas in t nagar like panagal park are all pretty clear. But the pictures seem a little dated. Some new buildings in the area that are around 6-8 months old are not there.
That said, this is a very good start and long overdue...