Well it's nice to know that someone's listening, at least. The Spacecraft points to Gregg Phipps blog entry, a PM for Spaces, where he explains the necessity for the URL change, the steps they are taking to mitigate the page ranking issues, and the fact that, yes, we have to do this one more time when spaces.live.com goes live.
We also heard the pain we created for our users with the URL change made in our release in January and to help mitigate this upcoming name change we have worked with the following companies to proactively address the associated ranking issues: Technorati Weblogs Feedster PubSub.com Bloglines Ask.com In addition, we have dialogues with the following search engine companies Live Search Yahoo Google I can't promise that this will be a completely seamless transition; but rest assured we are working hard to make this as seamless as possible.