Huh?
Right now Bitcoins are Inflating not Deflating good sir.
They will only start to "Deflate" when the 21,000,000 cap is reached.
But once again many, many people have a problem calling digital property "deflationary".
This is not true, you are being misleading with trivial semantics. Because there EXISTS a cap, bitcoins are DEFLATIONARY. It does not matter that the cap has not yet been reached, because everyone in the market has KNOWLEDGE of the caps inevitable existence. Therefore the market will treat the currency in a deflationary manner. You can read about deflation at
http://en.wikipedia.org/wiki/Deflation.
Agreed, any commodity with a finite existence is, in essence, deflationary. Gold has always been deflationary. More gold gets mined every day, but because we all understand it to be a finite resource, it's deflationary in nature.
With a currency it might be a slightly different analysis, as a currency exists within the bounds of its economy. Seen that way, Bitcoin is inflationary right now, all things being equal will become inflationary neutral in early 2013, and will then turn deflationary in 2017.