We've been using Slack for quite a while now after trying HipChat, FlowDock, etc, and love it. The major selling point for us is it's incoming Webhook API. We

We've been using Slack for quite a while now after trying HipChat, FlowDock, etc, and love it. The major selling point for us is it's incoming Webhook API. We use it to communicate deployment status, major customer events, and general fun & hilarity (/giphy).