Let me list some of the items I found there by way of explanation:

1. Long-time Windows internals guru and MS Technical Fellow Mark Russinovich offers a Channel9 preview of the long-awaited revision to his Inside Windows book with a show called “Mark Russinovich Goes Inside Windows 7.” If you follow the link to his “Pushing the Limits of Windows: Paged and Nonpaged Pool” you’ll find an interesting discussion of Windows memory pools and the first really cogent and concise of the dreaded IRQL_NOT_LESS_OR_EQUAL stop error code I’ve seen.
2. A nice series of Windows 7 Feature walkthroughs is also available. Topics covered include Windows PowerShell 2.0 (a major upgrade from the 1.0 and 1.1 versions available to Vista), the User State Migration tool and Windows 7 AIK, BranchCache, DirectAccess, UAC, the new Windows Troubleshooting Platform, AppLocker, Deployment Image Servicing and Management (DISM), and a whole lot more of great potential interest to enterprise admins.
3. Interesting spots of coverage in the Windows Client blog, including blogs related to Engineering Windows 7 and this very Springboard Series.
4. Links to news and highlights items (with an RSS feed to match), as well a link to the Windows 7 Beta forums. Makes it easy to keep up with recent developments, and the forums provide ample insight into what users love and hate about the current beta.

Do yourself a favor: if Win7 interests you, even only as a matter of curiosity, check these links out!