Hipchat - pleasantly surprised by the quality of this app.

Hipchat is being used within one of our departments (that I know of). We use JIRA to manage the details of our agile process, and as a corporation we use Microsoft Lync for instant messaging. Our IM client is horrible to use and many don't really use it. A group chat in the IM client only lasts for that session, so context of a discussion would get lost as other members are brought in. The client isn't available on mobile devices. That's where hipchat fills in the gaps...the integration with JIRA just enhances the experience adding more context to the topic being discussed.