Got transferred realbtc out of bitcoinbuilder.com today, for a trade done saturday. Thanks.

The reason it is possible to still trade on bitcoin builder is because now you can trade with virtual gox coins. All this means is that Gox-coins previously transferred to bitcoinbuilder is listed as numbers in bitcoinbuilders database. So let's say they have 20000 goxcoins in their mtgox account. This is currently inaccessible to bitcoinbuilder, but traders at bitcoinbuilders can still sell and buy whatever gox coins they have stored with bitcoinbuilder. But bitcoinbuilder will not be able to send gox coins to any customer before MtGox reopens their system, which might never happen.