And here's another idea for the site, in case you are looking for more things to play with ...

I presume that, for members, there is some record kept, perhaps on a cookie?, as to the last time they visited the site.

Suppose that we somehow had the option of permanently setting the "Age" on the thread listing page, to "since last visit" ???

Then we would automatically see all the threads - and only the threads - which had had postings since our last visit - whether this was yesterday, or three weeks ago.

What do you think?