Dropbox, a file storage program I have been using for years, has added a document creation feature it calls Paper. It offers basic text editing tools which do a bit more than the editing tools in Evernote. Evernote has some basic imaging editing tools, but Paper does not. You have to use a third party editing tool to edit images with it. Both applications support rich media and let you share your files.
A Ph.D. student reports on her experience using Evernote to keep track of lab documents.
Another app from the Evernote lineup. Scannable lets you scan photos, business cards, documents, etc., and share them via Evernote, email, etc.
If you use the free Evernote note-taking and organizing program, you can download a free screen capture plug-in for it called Skitch. Skitch functions pretty much like SnagIt. You can download it for Windows machines, Macs, and mobile devices.