http://www.regexone.com
An rt interactive tool to teach people how to use regular expressions. Took a couple weekends, but was my first dive into AWS and PHP MVC frameworks (Kohana) too :)
I can't speak for other frameworks, but I definitely second on Kohana, it's light and gets out of your way when you need, yet affords a lot of the newer best practices. If anything, documentation for v3 is lacking, but the forums are somewhat active and the php code isn't actually that complex. Application structure and the idea of overlays on top of system files is an interesting concept and pretty useful.
But due to the spatial nature of the mesh networks described, either the networks would require wifi to span cities and states or each cluster would need their own set of services? If that's the case, it's not really the internet as we know today?
I'm not sure I fully understand -- what is the internet without the services that you use on it? If common sites like youtube and facebook aren't directly connected to this network, will this work? And if not, then what makes this the internet and not just an adhoc mesh network?
I'm surprised that nobody's ever mentioned http://epresence.tv/! It's actually fully open source (we use it for archiving our own videos) and it already has powerpoint integration and a slick website. My friend at the UofT was taking a course there with Prof. Baecker and says it's pretty awesome to have video archives with slides to review notes and what not.