DigixDAO aims to make cryptocurrency a stable, viable solution for long-term wealth storage. the DigixDAO Gold tokens are tied to the value of gold - with one token representing 1 gram of gold. This ties the coin's value to a real-world object that has relatively little volatility - particularly when compared to other cryptocurrencies, such as Bitcoin, which has seen many price spikes and dips over the years.
the DigixDAO tokens are in the Ethereum EIP20 format, hooking them into the Ethereum ecosystem, meaning that they can be used in future Ethereum contracts for anything on the Ether blockchain. As it has a relatively stable value, it can also be used as the basis for other tokens and financial instruments that will then hook into the Ether ecosystem through the DigixDAO.