There are indicators that should be taken seriously.
MtGox is the market that has the highest liquidity; for that reason, it is the best place for short term traders and speculators.
In contrast, other markets have a larger spread, therefore transactions that take place there are much more likely to reflect demand related to the real economy.
With that in mind, it is interesting to observe that the volume of bitcoins exchanged on some of these
markets has been increasing consistently over the last few months:
- btcchina has had the most spectacular growth: http://bitcoincharts.com/charts/btcnCNY#vzm1g10zm2g25
- virtexCAD has had a nice growth too: http://bitcoincharts.com/charts/virtexCAD#vzm1g10zm2g25
- bitcoins are now the 3rd currency traded at virwox, in terms of volume: https://www.virwox.com/
(4Mio SLL/day, slightly behind the USD)