So, it turns out, letting your Kindle 2 get to less than 50MB of space is not good for it. I experienced:
1. Random lockups doing searches outside of books.
2. Lockups doing searches inside of books.
3. Lockups when trying to start text-to speech.
So, I've deleted some more files. I've also cleared out the indexing directory and letting it re-index from scratch for a few days. (I don't think old indexes are deleted when old books are deleted or disappear.) We'll see how it does. None of the lockups were fatal; just required hard reboots every time.
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