[rdl]

I'd rather use one with an exceptionally good security policy (including account recovery), realtime multi-modal notification, customizable settings (i.e. being able to ip/geo restrict, rate limit, etc.), etc. And maybe do groups, too.

Google Apps for Your Domain could be kind of like this, but isn't. Probably the closest, though.

Maybe someone like Dropbox/Box.Net/AeroFS?

[StavrosK]

This is basically exactly what I built https://www.persowna.net/ for. It's still in its infancy (as is Mozilla Persona), but that's where I want to take it.

Can I email you to talk about your needs a bit? It sounds like you have some good ideas.

[rdl]

sure