i think there are compelling reasons to have a strong EUR market. bitstamp seems to be stuck on dollars, because of liquidity concerns. but this creates unwanted fees for converting between dollar/euro with their bank.
this is a gap that kraken could fill.
Congrats Kraken!

Love your name.
I am very surprised to see only EUR and not USD, what's the reason for this? (I understand you don't offer for legal reasons in US, but is not trading in USD also for legal reasons?)
On the other hand, I think it's a good idea to trade in EUR, indeed there is no successful EUR market. And bitstamp does cost money in constant USD/EUR conversion for all the Eurozone inhabitants. BTC24 proved that a EUR market can flourish.
We're working hard to complete our regulatory compliance in more areas of the globe, including most of the US. We'll offer USD once we get greater US coverage. If you're in an area where we can currently offer fiat deposits, it's possible to deposit USD to our bank account now, but it will get converted to EUR in your account and you'll have to trade in EUR (and you'll have to pay the conversion fees).