Thanks, Andy.
I was frustrated last night because I couldn't figure out what I could safely delete.
With a calm head this morning, I found about 50 MB of stuff (N800 manuals in every language I could imagine! Sample photos. Nokia video ads!) that I had never paid attention to in the past. All seems to be well again.
I have long ago moved all the ~/ files to a card. I will see what I can learn about moving applications there too.

Walt