Damn!! Just discovered Slack (nice!!) now I need to go for Pingpad!!!
There are greats apps for groups to complete tasks and great apps for group communication. In Pingpad, the group has a single app that allows for both.
Pingpad is a stew of many different first generation apps for notes, lists, calendars and instant messaging. In one space, a group can work across platforms on documents, chat back and forth and post pertinent links all in real time. Think Google Docs meets Whatsapp.