I was chatting to my friend Steve Scaysbrook from the Konstruckshon blog today. We were looking at connecting our Evernote database to a Vectorworks drawing. We certainly found a way to do it.
Vectorworks has a hyperlink object that allows you to create links. The hyperlink object can open a website, open an application, etc., so you can use it to link part of the drawing to your Evernote database.
If you were on site surveying a project, you could use your mobile device to record notes and photos. These can be synced to your online database.