Personally I take a softly-softly approach.

xrefer has these articles:

http://www.xrefer.com/entry.jsp?xrefid=442406&secid=.1.-#s.1.-

http://www.xrefer.com/entry.jsp?xrefid=594022&secid=.-

The first of which notes that:
The use of the hyphen to mark compound words has existed in English since the 16c, and from an earlier date in various forms in words such as to-day and with-out. It has always been variable and unpredictable.

Bingley

Bingley