Bloggers who use Movable Type (or other Perl-based blogging software) AND who are hosted by Cpanel-type hosts may wish to note that an update today to Cpanel buggered many ISP's Perl installations. Details here.
I was unable to update Interocitor for a few hours today due to this. If you hit the "Comments" or "Trackback" link on an MT site, and get a long perl error message instead of what you expect -- or can't log in to post to your own site -- this is what is going on. Apparently, the ISP needs to rebuild each domain's Perl modules to fix the CPanel screwup.