Although somewhat dated by this point, Educause's article introducing Google Apps is a great springboard for anyone that hasn't yet taken advantage of the opportunities offered by this software. As a teacher who teaches three subjects (and collaborates with others for each), Google Docs has proved indispensable for unit planning and resource gathering. We don't have to be in the same place to collaborate, and all we need to do to submit our plans is share them with our supervising Dean. It truly makes the planning process much more efficient.
Google also hosts several other apps, although the one I would next like to recommend is Google Forms. Google Forms does wonders to collect data and organize it in a meaningful way. For example, my building currently uses it to track accommodations and modifications provided to students with IEPS or underachieving students. It has gone a long way to reducing the amount of paperwork with each of these tasks- we only need type a few words and check a few boxes to have a detailed spreadsheet compiled. When used correctly, it is certainly a great tool in reducing the educator's workload. I would recommend that any educator that isn't already using Google Apps to start with these two.
References: Educause (2008, March 19) 7 things you should know about Google Apps. Retrieved from http://www.educause.edu/library/resources/7-things-you-should-know-about-google-apps