OK so if I leave the default currencies there (USD, Pounds, Euro etc.) it works beautifully and converts to BTC at a decent exchange rate during checkout, but I'd really like to have the option to display prices in BTC while browsing. Is there some easy way to add a currency that will match MyBitcoin's exchange rate? I can see the currency entries in the database, it looks like I'd just need to set the BTC entry's exchange rate to 1/usd_value but I'd rather not hand-code all that if there's already something integrated or someone's already written the code.
Has anyone already tackled this?
Edit: I have no problem doing the work myself if there's no solution, I just want to know if there is one I'm overlooking or if I should do the work. I'm pretty sure I've got both a Mt Gox ticker API script and a simple database update script just laying around that I could bash together, but I'd rather use something official, developed by pros who speak PHP fluently (unlike this .NET pro who speaks PHP quite poorly 
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