I've been using Zendone (http://www.zendone.com/) since their early beta releases. It is out of beta and continues to fit well into my workflow.
It syncs with Evernote and uses a specified folder (I use "@inbox") as the inbox for processing items per GTD. They also have an iOS app for iPhone which seems pretty good (I don't have an iPhone and can't give details on the app).
I'd encourage you to check it out.
Note: I'm just a happy user of Zendone and not a company shill!