"BeamItDown Software and the iFlow Reader will cease operations as of May 31, 2011. We absolutely do not want to do this, but Apple has made it completely impossible for anyone but Apple to make a profit selling contemporary ebooks on any iOS device. We cannot survive selling books at a loss and so we are forced to go out of business. We bet everything on Apple and iOS and then Apple killed us by changing the rules in the middle of the game."
You can read the full story here.