Just synced text, even if it happens to be markdown text so it's a bit prettier, is not valuable to me.
Evernote's ability to quickly drag in some pictures and throw some text in to explain them is what I want. A real notebook allows me to sketch. A digital notebook must also allow me to incorporate concepts that require pictures because they can't be easily written as text.
To improve Evernote, I would like the "notebooks" to actually be tags, so the same document could appear to reside in multiple places.
I would like it to have h1,h2,h3 header tags, so I could build documentation that had structure, rather than just manually making some text big and bold to pretend to be a header.
I would like a "table" creator or tag, so I could add table data easily.
I will never give up my embedded pictures though.
Screenshot: http://stillblondeafteralltheseyears.com/wp-content/uploads/...
Every branch of the tree should be a Evernote-style multi line note with text formatting functionality. The tree would be a file system like structure, but the Workflowy UI feels much less clunky than Google Drive/Dropbox or similar services. Workflowy supports marking nodes as completed, so a service like this could even work as task management system.