John,
I just added the following to your example:
...................................
tnow = time.time()
y = numpy.fromiter((tuple(i) for i in x), dtype=[('a',numpy.float_), ('b',
numpy.float_)])
tdone = time.time()
print 'Numpy.fromiter %1.2f elapsed seconds'%(tdone - tnow)
...................................
Here are my results
with dtype: 4.43 elapsed seconds
w/o dtype 5.78 elapsed seconds
Numeric 1.17 elapsed seconds
Numpy.fromiter 0.62 elapsed seconds
23.7
1.0
Numpy, one point.
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