In terms of the application, perhaps this is part of a larger effort of unifying the conference software. For US, we are looking at other options for 2017 and will be syncing up with the EU group, which I know has distributed its software to other conferences successfully. With some joint-hacking, we may be able to make something that fulfills all of our needs ultimately maintains that central repository of content and encourages all of the other PG conferences to use the software. It sounds good on paper, but I admit it is a bit dreamy at this point and requires quite a bit of time and a concerted effort ;-)
I did consider putting that into the pgeu conference codebase, but decided it was a bad idea. There will *always* be other conferences that are not running on that platform that we need to cover - for example pgdays attached to other conferences. So we'd be separating things out. The whole point of the list is to have a central registry for those things.
I think the right thing to do is to add this functionality to the main website, not just the wiki. That would enable discoverability properly. And if we add a decent enough API to things, we could still have it for example automatically get fed a list of which talks exist at "our own" conferences while also allowing manual submission of things (which should as Joe pointed out both allow slide uploads and links to other sites).
At the core it would probably be about the same amount of work as putting it into the conference software itself, and I think the effort is better directed at making it a central registry.
