I've just seen an instance of JIRA 3.12 running happily on a public site. Does anyone know of even older versions? I'd suggest obfuscating the URL a bit because there are a number of vulnerabilities in those old releases.
The O'Reilly page for Practical JIRA Plugins is live! The second book follows the poultry theme of the first and has a duck on its cover. This book is a bit more technical than Practical JIRA Administration but should help anyone wanting to write their own plugins for JIRA.
p.s. Guess what I'm going to eat to celebrate this book!