The links below contain music available as streams or for download. Enjoy!
Musicindiaonline has streaming versions of both vocal and instrumental recordings. Some part of the collection is mislabelled, however. Who knew that the Mishra brothers both sing and play the sitar.
Patrick Moutal has videos (in Quicktime format) and digitized mp3 versions of old 78 rpm recordings. Naturally some of the latter are scratchy but the sheer scope of this collection is mindboggling. Agrewali Zohrabai, Faiyyaz Khan and many more.
Rajan Parrikar has articles on over thirty ragas accompanied by audio clips (Realplayer). Bewarned that the commentary strongly reflects the writer's prejudices. He also maintains the Vijaya Parrikar Library which has recordings unavailable commercially. These are catalogued by musician.
The ITC SRA website is hard to navigate but has searchable archives as well longer recordings of their artists of the month.