You cannot invest in slock.it. You can create DAO tokens by sending your ETH from your Mist wallet to The DAO address. With this tokens you can vote on proposals. The first proposal of The DAO is the slock.it proposal: http://download.slock.it/public/DAO/Proposal1.pdf
Right. From my discussion on https://slockit.slack.com/messages/trading/
it seems you have invested in some kind of organization/fund that allocates to projects with some kind of voting method, BUT :
suppose slick only needs 5 mio usd equivalent of ETH for funding of their project/contract and the number of DAO tokens generated by the end of May represents an equivalent of 20 mio usd : is it that all voters in favor get their allocation to slick pro rata and it is not a majority of votes that binds all voters pro rata to their tokens ?? Because if it is majority voting, then what happens to the 15 mio 'cash' left in the DAO?
Also, it is my impression that it says on the DAO that it is a 'one off' token generation for all possible projects present and future. What happens if there are many other projects in the future but the vast majority of ETH has been allocated to slick? Does the value of the DAO token generate possible other investments in a leveraged way, using DAO as a currency in itself by valuing previous investments / stakes in earlier projects like slick ?