I started a new twitter account to tweet about the ragas that I notice in film songs. Not all songs are based on ragas. Infact, there are a very few songs that are composed keeping a raga in mind. So if I come across a song where the composer might have used a raga, I will tweet that. If you are on twitter, please follow @filmi_ragas.
I have also added a section titled 'Ragas in Films' in the sidebar of this blog which lists the recent tweets from the above mentioned twitter account.