Get Puredyne one of three ways: (1) download and burn it on a CD or DVD, (2) purchase the Puredyne USB, or (3) download and create your own bootable USB stick.
Download the latest Puredyne version 9.11 - carrot and coriander - from one of these:
or by BitTorrent:
And here's our guide how to create a live CD/DVD for your PC or Mac.
(We are always looking for new mirrors - see this mailing list post and get in touch.)
Puredyne also can be bought, in the shape of a 4GB bootable USB stick. It is tiny, but provides you with the complete puredyne GNU/Linux system including all software, and extra space to store your files. Once you have the key, follow these instructions to boot Puredyne on your machine.
(Note: this is an open-source/free-software project and so as usual the software is distributed in the hope that it will be useful but without any warranty! :)
PC ONLY: the current stick cannot boot on Mac (do you know why? tell us!)

Of course you can also create your own bootable USB stick. It takes a bit more effort, but it's well worth it! Using the provided make-live-device.sh script you can easily create a liveUSB or liveHD directly from an existing ISO, or better, directly from Puredyne itself! Instructions here