This is good stuff! PIMs were such useful bits of software: Agenda, Packrat, Sidekick, Organizer, Ecco...
I am a Mac user but I'll be watching this very closely. I would love to see this get some traction.
EDIT: Sorry, thought I'd better add something of substance here. One negative is that I have to trust you that it is secure. I get the integration of Calendar, messages, notes etc. but the password manager is a step too far in terms of trust for me.