There's a lot to write about for developers and non-developers in Avalon and Indigo - and in Whideby (which I'll be covering by-and-by) - and it's important to get people who weren't at the PDC to think about the tools and technologies, and just what they'll mean for their next few rounds of IT planning. While Longhorn is purely a desktop OS, I believe Indigo will have a big effect on server deployments and the shift to service-oriented architectures that's happening across the industry. There's also a lot in Whideby's generics support and the pattern-based thinking (especially in the Whitehorse modelling tools) to help architects develop the solutions they need.
Now to see Whitehorse folded into DSI. I'm meeting folk from the management tools team next week at IT Forum, so I think that's going to be a big part of any conversation I have with them - understanding how they intend to go about linking SOA development tools to service operational management.