I should have learned by now never to release something after a full day of coding. The last release had a few bugs, which Jerome spotted at once (I even mistyped the release version in the announcement, it's 0.1 not 1.0). I have fixed the bugs, and will release rc2 in a few hours. Rc2 will also include duplicates detection on comment insertion.
Just a few hours after rc1 was released Jerome wrote a nice review of WPFF, suggesting a few features that I will implement in the next few days. And Matt offered to host WPFF on the new Subversion repository system they're moving WP to. Thank you Matt, I will probably accept your offer if I can work out how to connect to the subversion repository from behind my very strict office proxies (maybe a ssh tunnel to one of my home systems).
I have added a simple rule to avoid duplicate comments or duplicate post notifications. I will release rc2 in a couple of hours.