I had (have) something weird going on. As I had mentioned, I have two N800 NITs. N800 (unit A) which was the first of my two units I updated to Diablo refused to show Free42 in the list of installable apps regardless of what I did, nor would Free42 install from the Maemo site as an installable download.

I did verify that the repository.maemo.org/extras (with chinook and diablo, free non-free) was in the catalog listing and that the catalog was enabled, but still no Free42 in the listing under ALL.

I updated N800 (unit B) to Diablo and edited the repository.maemo.org/extras added the parts about chinook and diablo (this now matched my N800 unit A) and Free42 was in the list on N800 unit B.

Free42 is installed and running on unit B, but not unit A.

Like I said, weird.