"Will the DAO token sale accept Bitcoin, Doge, etc.?
Yes, we have partnered with Shapeshift for the DAO token sale to accept most cryptocurrencies in existence, including Ether, Bitcoin, Litecoin, Dogecoin, MaidsafeCoin, StorjcoinX, Bitshares, Ripple, BitUSD, NXT, DASH, CLAMS and many, many others. Prospective DAO token purchasers will benefit from higher limits than the Shapeshift default during the DAO token sale."
Source :
https://slock.it/faq.md#a4