as you can see Bitstamp is at 9k+ while MtGox sits at 20.8k for the past 24h. That's about 44%. Yesterday Bitstamp's volume was at 40% of that of Gox.
Things are really looking up for Bitstamp with the increased liquidity and a huge 5.3% spread to attract fiat and more traders. If I were buying in today, there's no doubt I'd be sending the wire or SEPA to bitstamp, not gox. Here's to hoping the Gox monopoly ends soon! Even if the arbitrage opportunity is gone before my funds get to Bitstamp, I'm pretty sure I'm going to like bitstamp more than Gox. Gox is like an awkward cousin: they may be family, but you can't wait to get away from them ASAP.