I was introduced to planworld late last year. I’ve used it pretty regularly since then, and will continue to (despite it’s every dwindling participation level) in addition to amhpub and likely check that more often. Amhpub no doubt has significant technological advantages over planworld, and allows for a level of public dialogue that is not possible there, but at the same time, there is a definite elegance to the simplicity of planworld:
Nothing is ever more than a single click away.
You can easily mantain a list of other people you want to keep track of, and are immediately notified whenever they update their plan.
Everyone’s user name is the same, so that there is never any question of who wrote something.
A mechanism is available for simple private dialogues.
There is a large network of recent alums who are active on planworld.
As much as it pains me to say it, I imagine that many or all of these elements could be instituted on amhpub quite easily. At that time, I will migrate to amhpub full-time. In the meantime, I will continue to use planworld and check amhpub occasionally, and invite all of you to come and check it out as well.
http://neon.note.amherst.edu/planworld/