I’ve just finalized version 1.0.723.126 and it is now available from google code. The majority of the update involves the introduction of a TortoiseSVN comment dialog. The dialog currently has only defect tracking implementation for Jira, but it allows you see a list of defects, check off the related ones, optionally resolve/assign the issue… All in all it works well to streamline closing defects in Jira.
Get the code or read the install guide.