Our host is doing some site-wide upgrading between now and Oct 5th, which is likely to result in sporadic downtime (it shouldn't be much, but one never knows).
Hopefully this will mean improvements afterwards, as they are upgrading not only the email systems but also the db systems, which I believe have been the source of the overall slowness we've been experiencing now and then (with occasional double-posts in the forums and/or white screens, etc.).
This, combined with my addition of some spam bot blocking code, should mean things will be much smoother by the second week of October.
I've also noticed a trickling of downloads on the OoH Downloads page which is good news - appears this is working properly again for most people.