Also, it should be noted that BitInstant is a "derivative service" in Bitcoinland. Meaning, people only use BitInstant if they're already using (or plan to use) Bitcoins for some other useful purpose (whether entertainment, shopping, value transfer to 3rd party, paying for services, etc). BitInstant is not an end-point for Bitcoin funds, but merely a bridge to other end-points. What this means is that whatever size BitInstant achieves, the real Bitcoin economy must necessarily be some factor larger.
BitInstant can thus be viewed as a fractional proxy of Bitcoinland, so these figures are quite wonderful to hear
