In terms of info filtering, I use a combination of rss as you suggest, and twitter key word searches like Craig recommends. I’ve been tracking blogs in my main areas of interest for long enough now that most of the key ones are in my rss feed, but twitter is great for finding good one-off posts and new sites that have slipped under my radar.

In any event, it’s definitely challenging to keep tabs on everything.

Even though I know it is an incomplete solution, I increasingly use Twitter keyword streams (saved searches) as a way of tracking network posts by topic which I find significantly relevant.

True, delicious is perhaps the most powerful online tool I use for its tagging, sociability and ubiquitous access across different computers, devices and browsers.

Thanks for posting these compelling thoughts.

This really is a good question because I was recently asked if I knew which (already existing) tools could be used to pool experts for some online collaboration (on water & sanitation and – as you already mentioned – despite of all these wonderful networks there’s no true online collaboration tool which can be used from within different networks (partly because of their walled gardens philosophy).

What we need is in an interface/api to have something like Google Wave integrated into all these networks and which allows us to collaborate from wherever we are.