Mike,
Can't offer any authoritative references, but I always tell people to use the fastest they can get away with - it doesn't (or shouldn't!) take long to work out what you can successfully hand hold at. Sometimes it is not possible to get the shutter speed you want, so you just do your best.
For example take my current picture of the Jay in the gallery - I pushed the ISO up to 1600 but still only got 1/125 at 550mm, so I made sure I was rock steady and got away with it... guides should only be guides etc.
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