Meh, what the heck ... some people already noticed / discovered it anyway ...
I put a preview of the new site up on the original .com domain if anyone wants to try it:
It is incomplete but should show some of the new features.
Right now the home page shows topics for the entire site which you can sort by when they were started, last updated or the number of posts (rating will come later). You can also change the number shown per-page and turn on or off the 'snippet' display (supposed to be a representative sentance or two from the topic). The green 'welcome' box on the home page can be closed (X in top-right)
If you click on a subject then only topics within it are shown (and so on if you drill down into further topics). So, there is an 'active topics' at all levels.
Clicking on a poster gives their posting stats so you can see if they are new, an old-timer, if they predominantly 'advertise' (start topics) or discuss (post replies) and you can get a view of their topics in the same way as above.
Search works but it's simple right now and will get more filtering options soon.
And of course topic-view works and should show similar topics on the same theme on the right. There's also a link back to this (JWN / .net) site so you can use it to read and switch back to post for now. I've tried to make the view simple and focus on readbility (optimal line-length for font-size).
All the old URLs should work too (so best-of links etc). In fact for most pages, changing the .net to .com in the address bar should take you to the corresponding page.
Still lots to do but let me know what you think.
Performance should be fairly decent.