This looks to be nicely implemented - thanks Paul, an excellent facility for the site.
I won't pretend - I'd have loved to see some kind of button that was visible when you first hit the site, that enabled you to see the latest releases - but if this isn't possible, would you consider making Latest Releases the default search order?
This would actually address the second point I was going to pick up on: I'm not sure if I'm in favour of listing the 'most popular' games by default - whilst I do think it's really valuable to track the most popular downloads (and making the order visible as a selectable option), I can see certain games building up a huge number of clickthroughs purely because they happened to appear on the first page in the early stages (see the numbers for 180 Darts for example, and more recently Martello Tower). I think we'd get more genuine, less-skewed numbers for most popular games if the titles were ordered differently by default. (Appreciate you could argue that the same would apply if we were to order by latest releases, but I'd actually consider that a huge positive - as I mentioned previously, it can be a lot of work trying to convince some folks to even try out new games for older systems!).
Another thing - do you remember in my original mockups I included a secondary 'list' view of the the archive?

Well, I think some of the new search indexes would work very well if a 'list' option was offered (such as the Latest Updates index, for people who want to maintain offline copies of the archive). Can you see this being something you'd ever consider implementing? Appreciate it could represent a lot of work, so I'd understand if you were to rule this out.
Last comment - I'm not sure whether I see the point in the 'earliest releases' option - I doubt it would get much use, but I suppose it doesn't do any harm having it there as an option. What do others think?
Anyway, just wanted to thank you again Paul for continued input on the BBC Micro site - I'm really grateful that you took this on and I'm so pleased to see new features still being added, when it could easily be considered 'complete'. Not forgetting the work of the other contributors (Mick, Lee, Chet et al) either - thanks everyone!