Street Food in New Delhi

Al Kauser
Near Assam Bhavan, Malcha Marg

Al Bake
NFC Market

Delhi

Places I have been to and liked (well mostly) listed in no particular order:

Park Balluchi
Deer Park, Haus Khas - turn from Green Park Church (Aurobindo Place Market) and keep going towards Haus Khas Village
expensive
good, large quantities
North Indian cuisine - bar

Oh Calcutta
Nehru Place - Opposite Satyam Cineplexes
expensive
very good, moderate quantities
Bengali cuisine - bar

Spicy South
Kalkaji - near G-Block Busstand