Topicmarks is a useful way to summarize and read. It takes some getting used to but is a great service for taking a long paper and extracting meaning. It is like an indexing engine. It is a bit tricky to learn how to drill down but once you do, you can use it to read everything from your google reader to your evernote and google docs. It is definitely a handy tool for researchers.
Here's a how to for you IT people who want to hide some users from the Global Address list. This way, some users can't be looked up by everyone in the organization (things like your generic front office email, etc.)