As one of my colleagues put it, "We all struggle to stay up to date on our new technologies." To that point, he let me know about a goldmine resource for learning ADO.Net Data Services quickly:
Great Screencasts
These are just slightly outdated, but they’re very clear and to the point. Each is about 15 minutes long so you can become quite knowledgeable in about 2 hours.
In all honesty, these are significantly more valuable than the two slide decks included in the .Net 3.5 Extensions Toolkit.