Yep. The user chooses the organisations they wish to donate to, they are given an address to send there donation. When the donation is received it's distributed between the chosen organisations and sent. All done as simply as possible so you can donate to loads of worthy organisations in seconds.
It's not meant to, it's if you wish to donate it makes it easier to find/discover organisations accepting bitcoins as a method of donation. I know there's a page on the bitcoin wiki but you still have to go onto each site and search for the bitcoin address. This also makes it easier to send to multiple organisations quickly and painlessly.