On the Microsoft side we're waiting for Atlas to become standardized, complete, (marketable?). It's declarative, more IDE friendly it seems, and at least for me, less intuitive.
Anyway, part of the problem might be my ability to understand it and see where I can leverage it so I'm going to be in Jeff Prosise's session on Atlas at TechEd. A few questions I'm thinking of are as follows:
1. How to control when data is bound, doing filtering and other operations using javsacript.
2. Will Atlas play well with JSON? Not JSON being shoehorned into some Atlas app, but more like the ability to return JSON style strings from the server.
... I'm sure there are more, and I'm sure that after the session I'll have a much clearer picture of Atlas and it's future in web apps for Microsoft developers. I am pretty sure we made the right choice on the current project, but a year from now I could be singing praises for Atlas.