True, "usable" is certainly subjective. I did try to open the Conboy notes in Tomboy, but nothing happened. Looks like there still needs to be a conversion of some sort?
Assuming Tomboy can read Conboy, (is it the only way to read/edit a Conboy file?) I would be very happy to use both if I could get it to work, and if there were a simple-non-terminal way for Tomboy to fetch a Conboy note off my n900, but it doesn't look like that is supported.
I still think that Conboy could export/copy a note to any directory as an editable file (XML, RTF, etc.) I guess consider that a feature request.