I've seen many people posting that don't quite understand how/what market capitalization is and how important it is to Bitcoins. Calculating market cap for Bitcoins is very easy. Take the Bitcoins outstanding (about $10.9 million) and multiply it by the current price (currently at $63) and the resulting $686 million is your market cap. For comparison purposes Facebook market cap is $6 billion. Market cap is important because the larger it is, the more likely that investors will invest in it because of the perception of liquidity and stability.
Below is a chart that demonstrate how market cap increases for Bitcoins.
http://img685.imageshack.us/img685/7928/marketcapbitcoins.pngProbably because it is Saturday, but I'm so surprised that I haven't been able to find a news about how this morning the market cap for Bitcoins dropped from $744 million ($68 price) to $572 million ($52.35 price) and then climbing back up to $738 million ($67.5 price) in less than 4.5 hours. I've never heard of that happening and I'm a retired financial analyst for a brokerage firm. THAT IS INCREDIBLE and is further proof that Bitcoins don't follow normal rules. It is unique from every financial investment product ever created.