I'm interested in contributing to the first two topics (real time notification data & tools, and Maps & Visualizations).
Specifically, I've been working with Meteor (a full-stack web app platform, now with Cordova support to create app-market friendly mobile apps) which is a great platform for rapid prototyping of real-time reactive apps.
I am interested in creating meteor packages for civic datasets and related maps, making it easier for others to then create rich mobile/web app experiences that can incorporate them. Once I understand how to do this effectively for one data source, my expectation is that supporting others will be easier.
I would love to talk to folks who have specific data sets or map visualization requirements (or ideas) to see if that would be a good target for that first project.