All being well, we’ll have something up that prunes no-longer-active sites from developer licensees’ lists of sites in the next week or two. We’ve been making a number of improvements to the licensing server code (we had to write our own – when we launched, nothing decent was available on the market) in the last few days.
Following up on this, with a bit of a different question…
I had a client site on which they moved to a new vendor, and I no longer have access to the Admin area. The domain still appears in my list, which might indicate that the new vendor hasn’t uninstalled the plug-in.