Stained forum post from the developers explains why they are reneging on their commitment to give Steam keys for Stained to those who purchased the game through the Indie Royale Debut 3 Bundle (thanks nin via Joystiq). The story includes the explanation that they only sold around 300 copies of the game, earning them a total of around $3,000.00. Here's a bit:

This may come as a shock to you guys, but we have decided not to distribute the keys any more to the IR bundle purchaser. The game is not selling at all and there is no hope. I think we are already doomed so we are abandoning the process of distributing the keys. We will continue to do what is required to make the living and provide support to game related questions twice a week. If you really love this game you should consider buying it on steam else I think you already had your share of enjoyment when you purchased the game via IR-Bundle for 50 cent.

So no need to send any emails, we are really sorry.

If you still have more questions & and really feel sad about this, Here is a short FAQ for you.