Tim Bray has a blog post entitled Blogging Cam: Almost Right where he writes

Via Niall Kennedy (who’s been very good lately): Microsoft cameras that have one-button publishing to MSN Spaces. This is so wrong. I don’t want to see a future in which your camera is LiveJournal-enabled or Facebook-ready. When I get a computer or a mobile device, it’s either Web-ready or not, it doesn’t have to be MSN-enabled or Yahoo-blessed.

I agree 100%. I worked on the APIs for MSN Spaces and this was one of my goals. The APIs we expose should be industry standards (de facto or de jure) and we shouldn't think of APIs as being the purvey of exlusionary deals. We are waiting for some things to pull together such as the the Windows Live ID client SDK before announcing more APIs. In the meantime, you can assume that any public APIs we provide will be available to all at not exlusionary.