Upgraded to Movable Type 3.16. Rockier install than expected because of FTP problems, nothing to do with MT itself which seems as solid as always.
Will look around for a anti-spam plugin next. Been getting flooded with far too many fake comments lately and while none of them make it to the site itself, it's still annoying having to delete them and ban the IP addresses. SpamLookup looks most promising though I might wait till it gets out of beta. Or at least till I next get flooded.