Today, 13 August 2012 is Ajaa Ekadashi (Annada Ekadasi / Ananda Ekadasi). It falls on Krishna Paksha Ekadasi in Bhadrapad month as per North Indian Hindi calendar & in Shravan month as per Marathi, Gujarati, Telugu & Kannada calendars. In 2012, it falls in Adhik Bhadrapada Maas in North India.
Ajaa Ekadasi vrat katha or the story of Aja Ekadashi is mentioned in Brahma vaivarta Purana. This vrat katha is associated with King Satya Harischandra who was the very truthful king of all ages in Hinduism. He performed this vrata and got all his wealth and fame back which we lost in difficult times.
Chanting Vishnusaharanama Stotram & Sri Hari Ashtakam is highly meritorious.
Here is the Aja Ekadashi vrat katha.