Coincidentally, I was already using Dropbox, Skype, and Evernote. But I found the class was a great reminder of how we overlook or forget features of applications after we have fallen into habits of use, and how it is good to discuss with others how they are using these information organization apps.
I was new to Diigo, and am looking forward to trying its collaboration features. The document annotation features are reminiscent of what's available in Word or Preview/Acrobat.
I think this highlights some major changes in how we access data in the next couple of years. Local storage will become just a cache to allow you to continue to work offline as everything becomes cloud-based. You won't turn in Word docs in the MAC program in a couple of years. Rather, you will post a URI. That in turn tells me that the notion of hierarchical storage in directories will go away, as hierarchies just junk up the URI, and nobody can agree on a good hierarchy. This was already happening on the Mac, as I can find my annotated MAC benchmarks much faster using Spotlight versus navigating a hierarchy. And since we will be looking at cloud documents anyway, we will shift away from documents that look like books reproduced on a screen, and become more like web pages. Hence, Diigo for annotating that web page you'll be turning in for your final "paper."