Ideally, I'd like to see a pie chart with the whole pie being "Bitcoin-derived crypto currencies", and each major alternative represented as a market cap in Bitcoins and USD.
Currently, from what I gather we have:
- Bitcoin - 7,415,750 BTC = $34,854,025 = 99.7%
- Namecoin - 959,150 NMC = 25,897 BTC = $121,716 = 0.3%
I don't know where to get data on other crypto currencies right now, and if they even have any significant market cap.