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There seems to be plenty of data on the BTC financial market, exchange rates and the like, as well as on the technical aspects (network hash rate, difficulty etc).
I guess I'm not the only one interested in what amount of BTC is spent on actual goods and services, but all I can find is the occasional number by some specific trading platform, for some specific timeframe, nothing more systematic.
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There is no way to know this with a 100% accuracy. Because when you look from outside, a trader moving Bitcoins between exchanges is no different from someone paying for a services/goods with Bitcoins. Both are Bitcoin transactions. The same goes for people moving money internationally, sending their parents Bitcoins, a company paying it's employees etc. You really can't separate these from purchases of actual goods and services. Because like I said, they're all transactions.
However, if you want to measure speculative interest in Bitcoin vs. interest in Bitcoin as a currency(i.e for practical things) then you can look at this graph:
http://blockchain.info/charts/tx-trade-ratio
And the discussion about it:
http://codinginmysleep.com/measuring-bitcoin-speculation/
Both the discussion and the data is quite far from conclusive though.
there are a couple companies that are known to pay employees in btc, and you can check auctions on various bitcoin forums. this will help you do your independent research – CQM – 2013-07-09T19:07:47.563
I'm sure bitcoin store has this data, though I'm not sure if they would share it. Perhaps you can glean some from their site though.
– Loourr – 2013-07-10T01:07:33.380