Take the 2-minute tour ×  First, this is a follow up to this:
Why does my back wheel keep becoming untrue?  (The short version
is I bought a used bike a few weeks ago, I broke a spoke on the
back wheel, replaced the spoke, trued the wheel with a
tensiometer, and found that it had become untrue again. The
diagnosis was either the wheel was bent, or that the spokes were
just settling and re-truing it would sort out the problem.)
I've been riding it over a week with an untrue back wheel (aka
Kayak Mode). Today, I checked the wheel because the trouble had
become a big issue again, and found I had two (!) broken spokes
since replacing the first broken one a week or two ago.  So, why
are my spokes snapping like spaghetti? I guess:    1. Because I
was riding without truing the wheel   2. Because I'm riding too
hard (i.e. coming off curbs)   3. Some combination of the two,
or something else.   Your pal, JKD  POSTSCRIPT July 28, 2011
First, thanks everybody.  I wanted to follow up for people who
find this question l