Happy memories of the book shops on MG road. Last time I went most of the Bangalore book shops were a shadow of there former selves
The old book shops have been disrupted. Sapna is one that has adapted well, with a publishing house, decent web-presence, and has grown too.
For the best technical books, you now go to Tata Book House (may be others, I am unaware of). Novels, and such, Blossom's on Church Street is one of the best. Then there are cafe-bookshop types like Crossword, etc.
Kannada and other language book stores are also thriving.