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Karl,
Most of the good software (like dimension4) will do repeated pings to get average response rates from the server you are syncing to, and factor that in to setting the time. I sync my servers at work once a day (automatically of course!), and most times, the change in time is well under 1 second adjustment.
GPS time is good too, but the software doesn't seem to be readily available. I looked at this once, and read all the NMEA specs on how to read the time string out of the data stream. It's pretty simple really. My brother is a seismologist, and they use GPS to time sync all their monitoring equipment, so there is something to be said for it, just that it seems like it would be easier to just use internet time sync!
Turbo
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