I just tried to install the new version of Akismet.
I uploaded the files to the Akismet plugin directory, but WordPress 2.3.1 not only refuses to acknowledge that they’re there, but also persists in (a) telling me there’s an update of Akismet available and, (b) even stranger, presenting an earlier version of Akismet (2.02) in the Plugins Editor!
I’ve already tried Telnet-ing into the site, deleting the Akismet files by hand, and re-uploading them. Same thing happens.
I’ve tried deactivating the plugin first. Same thing happens.
I’ve tried removing the files altogether. WordPress still lists Akismet on the plugins page.