Household Production Bleg

A Century of Work and Leisure by Valerie A. Ramey and Neville Francis.
" We find that hours of work for prime age individuals are essentially unchanged, with the rise in women’s hours fully compensating for the decline in men’s hours"

Claudia Goldin's 2006 Ely lecture (in the AER) covers some of this ground. And it's just a terrific paper on FLFP in general.

Oh Bryan, you mean you have never read this?

http://www.gladwell.com/2001/2001_11_26_a_diaper.htm

Not exactly about labour saving, per se (I would suggest he gets it a touch backwards), but there are nuggets in Witold Rybczynski's Waiting for the Weekend.