It is, as usual, a VPC image that you can install on a standalone computer.
Be warned, that the size of the image is huge - about 7 Gb in 3 parts.
Here is a short description of the toolkit:
The Demonstration Toolkit for Microsoft Dynamics AX 2009 Pre-Release (CTP3) contains marketing materials, demonstration scripts, and a Virtual PC image containing a full installation of Pre-Release of Microsoft Dynamics AX 2009. You can obtain the Demonstration Toolkit on DVD from a Microsoft Dynamics Partner, or you can download the contents of the DVD using the links on this page.
Download link (Requires PartnerSource access)
It would be very interesting to hear any comments you might have about the CTP release, as well as about any major (and minor, as well) bugs you might find in this PRE-release. Feel free to e-mail me or leave a comment under this post.
P.S. (One day later)
An ISO image was also made available today. It is much lesser in size, and is an image of the installation CD + licence file for CTP3 release.
Download link (Requires PartnerSource access)