Tapulous is making nearly $1 million a month from its iPhone apps

"iPhone app developer Tapulous says its sales have approached $1 million a month, providing fresh evidence of the growing success of start-ups designing programs for Apple Inc's mobile device.
Tapulous -- with a mere 20 employees -- said its "Tap Tap Revenge" game series has now been installed more than 20 million times, with more than 600 million total games played."
Source: Reuters, 20th December 2009