I should be packing for my trip to Seattle tomorrow (22 hours of travel) for the SharePoint Conference but I just had to try out this new training content. It is based on the SLK, just like the end user version.
The Microsoft Office SharePoint Designer 2007 Training (Portal Edition) leads the learner step-by-step through SharePoint Designer features using easy to understand videos. Built with the SharePoint platform integration in mind and engineered to work efficiently with Microsoft Windows SharePoint Services and Microsoft Office SharePoint Server 2007, SharePoint Designer will help you customize your SharePoint sites to make it an even more powerful tool for productivity. SharePoint Designer is the ideal tool for Information Workers to build composite applications, design and customize workflows and tailor SharePoint sites to their branding needs.
You can easily add or remove training videos in this Training to fit your business needs. The Training also includes a reporting function that allows an administrator/trainer to track learners' completed training topics. You can customize the Training to fit the look and feel of your own Office SharePoint Server site.
Because I already had the end user version installed, I just uploaded the content zip files into a new folder in the existing training site. You can see the 20 SPD modules here http://www.wssdemo.com/training
Download links for both the portal and standalone install are also on this page.