This is an idea for an extra section to the spellbook to be used for help with instances. Friends are good to have, but they aren't always on, or always available. So, if you're about to enter an instance, be it a boss or level, you might not have as many people as you would like with you. So, how do you remedy this aside from waiting and/or realm hopping? I suppose if there was a feature that put you in touch with people available to run the instance, it would be easier. The feature could have a list of instances, sorted by location, and the option of a group or more. How would it work? Users who are looking for more people for the same instance could get connected and using a notification icon similar to the trade feature, teleport to a designated group leader.
