Google Docs

Google docs, theoretically seems like a great tool.  It's a neat way for everyone in a classroom group to access the same document at the same time, without the crowding that a tangible document, posterboard, etc might bring.

However, I personally have found a lot of stress dealing with it.  It may just be user deficiency... but until I gain greater skill in navigating and managing it, I think I would refrain from using it in my own classroom.