Web Address: http://todaysmeet.com
There are lots of great tools for online collaboration but some are much quicker than others. One of those is Today's Meet. Today's Meet allows you to quickly create a room where you can have others contribute to a conversation. This works as a back channel or chat while you can be discussing something else. It can also work very well to take questions from a large class.
One feature which can be very helpful is the expiration date. Today's Meet expires after a set time period making it great for use during an activity that you don't need to archive. Finally, it works really well from portable devices like iPods, Android devices and other tablets.