I've just made a major back-end update of the software that runs the forum. Nothing visible, no new features this time, but it was still a fairly invasive change: I swapped one set of sources from an older lineage to a newer, theoretically identical set of sources. The only major upshot of this change is that more of the site is now under svn control. If that doesn't mean anything to you, then don't sweat it. It's a boring detail.
In any case, this involved moving lots of major pieces of the site around. If you see something wrong, such as an image that won't load, or a link that seems broken, please let me know.