Funnily enough, I've been working on a little open-souce evernote clone side project for the last while, and was just contemplating making a cli client for it the other day.

https://github.com/ShaneKilkelly/radsticks

I may have to bump that up the priority list a bit, once I've done some work to make the project more ready for self deployment.

Please, drop me a line so I can ping you when we'll come up with one.

Check out taskwarrior.