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Next time you do a transfer or server switch which involves changing the IP of your site, back off the TTL (Time To Live) value on BOTH your old and new nameservers to something like 120 seconds (2 mins) a couple of days prior to the switch. This value limits the amount of time the data is cached, so even people already browsing your site will swap over to the new IP within a couple of minutes of the change. (Save for some stuck behind non compliant software which ignores the TTL and caches records for longer than it should.)
Remember to set the value back to 86400 or whatever it was previously at a day or two after the switch.
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