This morning I've been looking into doing a scripted migration our Sourceforge trackers to Jira. I wasn't able to find a working migration utility that does this, but it looks like it won't be too bad. Sourceforge allows the export of all project data (including trackers) to a big XML file, and Jira has several import options, the most palatable being the Jelly scripting facility. Right now it's a matter of doing the right mapping.