Something that can be seen as a ‘quick gain’ activity using Google Docs collaborative tools are class vocabulary lists, subject or topic specific dictionaries.
In ICT for example at the start of a topic I share a document which features a two column table, in the left hand column are terms we’ll use during the topic study, and in the right column is the heading ‘meaning’.
Simple but powerful task, I share the document with the whole class and at certain points direct them to add their understanding of the terms to the shared document.
Creating a resource that they’ve all contributed and can all use in letter sessions when writing longer essays which require subject specific vocabulary to be used.
It’s also a good document to stimulate class discussion based on terms they leave blank for longer than others!