I believe Mtgox may already be secretly doing something of this nature. If not, I propose the creation of a legion of Floor Makers who will stabilize the BTC price as such:
Step 1: Pick value for floor.
You buy Bitcoins at the floor to stabilize their value (and get cheap Bitcoins).
Step 2: Pick a soft ceiling. The soft ceiling would have a 45% angel. The idea would be to fill up this wedge with asks. You would add in asks or remove asks from the market as other people add/remove their own asks that would cause it to go above or blow the 45% angel line.
This would prevent bubbles and make sure there is real demand (and reduce your exposure risk to Bitcoins).
Step 3: As each bitcoin is sold you recycle the money (plus the bonus from ceiling/wall spread) back into the floor making it more stable.
Step 4: When another 'natural' wall begins to grow ahead of the floor, you move the floor up as the old floor has likely been obsoleted.
So my question is:
1. Do you think mtgox is already doing this?
2. Do you think this strategy would actually make money resulting in a larger floor each time or would the price increase of Bitcoins erode the size of the floor over time more than price volatility would grow it?
3. Do you think some people doing this would be a net benefit to Bitcoin, or would it detract from the currency?
(obviously you'd need to have a better definition of where to put the "floor" and where to put the "ceiling" but this is just for demonstration purposes. All I'm saying is you'd hook onto areas of high resistance for floors and areas of low resistance for ceilings.