Links are super important to the way I do GTD.
- The ability to link out, e.g. to Evernote
- The ability to link directly to a task. You can kinda do this for projects, e.g. http://app.gtdnext.com/#/projects/0b1f5df3-2d62-4666-a7c2-c8d4b0a373d4
It would be especially nice to insert links (e.g. an Evernote public link) to later have it display with, say, the note title (if/when first-class Evernote support is introduced)
In my trusted system, I use an outlook:… URI to link to email items that I will have to follow up on.