More Google+ links from the last couple of weeks:
An interview with Haida artist Jim Hart
A New York Times story about how scheduling software makes part-time workers' lives harder. Or does it? The MF discussion of the article makes it clear that managers have been doing the same things with lower tech for a long time. (G+)
Robert Lang talks about the way mathematics done purely for its aesthetic value (in this case mathematical origami) can turn around and have practical applications.
The earliest reference I know for the attribution of the problem to Hamming is http://www.cs.utexas.edu/users/EWD/ewd07xx/EWD792.PDF (Dijkstra 1981) — if you have anything earlier I'd be interested in
Edited to add: this is also in Dijkstra's 1976 book A Discipline of Programming: see http://web.cecs.pdx.edu/~cs410aph/Lectures/Smalltalk%20II/Dijkstra%20on%20Hamming's%20Problem.pdf
There are earlier publications on closely related problems of algorithmically generating 5-smooth numbers but without the reference to Hamming; see https://en.wikipedia.org/wiki/Regular_number#Algorithms for details.