The key thing that I and a bunch of my technical contacts were interested in was the portability between pods, which if I remember rightly was intended to allow a user to download their content and import it into an account on another pod. This would mean we could keep our own individual backups so if something went terribly wrong with where-ever the current data was hosted it would be easy to move to another pod.

This feature was down as "coming soon!" for a long time, but as far as I can see having had a quick look at the site for the first time in months, and that feature doesn't seem to be mentioned at all now.

This is a key problem for projects like this: many people who are interested in a particular aspect won't touch the project until that aspect is mature, or at least present, because if it isn't there already it might never turn up as project priorities changes (OK; so existing features can vanish over time for similar reasons, but this is much more rare).

EDIT: Just found mention of the above feature buried in the FAQ (it used to be on the front page or there-abouts), and it is now described as "in the future" not "coming soon" so I shall not hold my breath. Going by that document the "export all your data" half of the feature is present though, which would at least satiate my paranoid need to keep my own backups of everything.