This looks nice! I've long wanted a PDF viewer that had annotations that appeared off to the side and could be annotated collaboratively so I'm very excited to see that crocodoc has made progress in that direction.<p>Some misc. comments:<p>* The "chrome" isn't very android friendly. I'd really like to have something like this that would work well on a mobile device. In fact, it would be nice to have a full mobile app allowing local annotation/syncing with your web service. Currently, I just tried the site on my phone, but I have an android tablet coming soon and will be looking for a good pdf reading/annotating experience.<p>* When you download a marked up pdf file, it would be awesome if the notes could be included (possibly by shrinking the original document a bit. (or are the currently included and evince is failing to show them?)<p>* Syncing all of a users docs/annotations with Dropbox would be a killer feature. I really like this trend towards apps using Dropbox as user-owned cloud storage. (Dropbox isn't perfect for this, but is pretty nice).<p>* A bit more esoteric: many of the documents I read are two-column. It would be amazing if crocodoc could show just one column at a time to provide bigger text and more room for annotation. I've toyed with putting together some simple tools to display pdfs in this way, but never had the gumption to make something that worked.<p>Anyways, I'll definitely be following crocodoc.