I'm doing research for a large writing project and find that many of my sources are digital: interview notes, web pages, pdfs, audio files... Does anyone know of really good Web 2.0 tools that allow you to manage your notes, highlight digital files, etc. This what I've tried so far:
Delicious--ok for tagging, but I'm not highlighting
Diigo--let's me tag, bookmark, and highlight... but I can't highlight pdfs
Google docs--let's me create some collaborative files, but the outline functions aren't as nice as MS Word and it doesn't easily collapse and expand notes.
A way to organize all my notes for easy search, collapse and expand. Organize sources for easy retrieval with highlights and notes. Any ideas?