For a "get them writing" idea, I'd personally love a secure, cross-platform (including different mobile and desktop platforms, though I'd be happy with iOS/Mac OS for starters), journaling app that syncs without using a service that's proprietary to the app. I like Day One (http://dayoneapp.com), but hate that it's not properly encrypted and that it uses their proprietary service. What I think I want is the functionality of Day One with the sync options and security of 1Password. That would give me the confidence to pour my head into a daily journal. And, as far as I know, it doesn't exist.

Edit: Hm. I googled a little after posting and realized that my comment about Day One not being "properly encrypted" might be incorrect. It was based upon my experience with v1 of Day One. It looks like v2 added encryption and it was further improved with v2.1--though I can't speak to the strength of their implementation and can't find anyone who claims to have audited it. And they still only appear to support their own sync service.