Late 90s and early 2000s, I recall that Intel Inside, Lee Iacocca’s book, Who Moved my Cheese, Seven Habits of Highly Successful People, Jack Welch’s book, etc were commonly sold, in addition to the latest novels. I even remember buying Sylvia Nasar’s A Beautiful Mind (was popular because of the movie then) from a roadside vendor.
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.