> Slightly disturbed reflection works quite well (see my test table
> below), but I wonder how to achieve that strong, smooth blur I've seen
> in so many scenes during the last years - using a large scaling factor
> for the normal (e. g. 1000) yields weird results with high turbulence
> values, while using small scaling factors like 0.001 gives something
> remotely resembling my notion of blurred reflection, albeit still quite
> grainy.

It looks to me like you're using just one single bumpy texture, rather 
than multiple ones - or you've forgot to translate each of them 
randomly; you need either multiple layers (e.g. 40 as in the example), 
or - my personal preference - some slight but high-quality focal blur 
for good oversampling (anti-aliasing doesn't quite cut it), in which 
case a single small-scale bumpy texture will suffice.

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