At the last Meetup Jesse gave an introduction to RobotLegs. He discussed its origins and how it might be useful to your project.

After a quick look at previous meetup topics I did not see any of the other existing frameworks. Perhaps a good discussion point would be a comparison of the existing frameworks and microarchitectures. Kind of a pro/con discussion with some real world insights into their uses and the development drawbacks. I also think it would be great to try and obtain a (con)census of where we think the trend is heading in regards to usage and theory of these frameworks.

I would love to see a comparison of Cairngorm, PurMVC, Swiz, Parsley, and RobotLegs. Perhaps that set is too large however.