...
A Curator is an entity employed by The DAO to act as its real world intermediary, as The DAO itself it does not have the capabilities to build a product, write code, or develop hardware; The DAO purely manages funds.
The curator is the only entity that is allowed to add contractors to the DAOs whitelist, authorizing them to receive ether from the DAO.
Contractors
...
Slock.it will likely be the first contractor hired by The DAO. Their first proposal to The DAO will involve building and bringing to market a product called the Ethereum Computer and its complementary network called the Universal Sharing Framework.
Proposal
...
Only 20% of members has to vote for the poll being valid.
...