A mate of ours first brought it to our attention -- JIRA, our issue tracker, is the new requested "be familiar with" or "have expertise with" program. He forwarded along a job posting seeking candidates with JIRA experience. Being intrigued, I Googled the world of job postings myself. Among the required skills set of Java, J2EE, and AJAX, I noticed JIRA popping up here and there.

Pretty cool how JIRA has made its way onto that list of bulleted must-knows.