The story so far: I set up an account on Traackr, then became inclined not to use the service, because it didn’t seem to have taken any notice of the stuff I’d told it about.
Then, yesterday, I got an automated email from Traackr telling me that it had made my “asset data” available. More important, I got a personal email from Pierre-Loïc of Traackr, explaining the delay, while accepting responsibility for it. The tone of the email was very friendly, especially considering that I had reported the problem on my (public) blog, and not through Traackr’s support channels.
So, I’m back on Traackr!