Odd clock drift since summer time clock change

This is a weird one. Since the clocks changed back for daylight savings time (here in the UK, on Sunday morning from BST to GMT) I've been getting a strange error: while I'm editing a file in vi(1), occasionally when I come to save it tells me the file has changed on disk (it hasn't).
I thought I was going mad until a colleague said he's seen the same warnings on his machine in Eclipse. It seems to me like the clock is constantly drifting/being adjusted - I'm syncing with NTP to time.euro.apple.com, and I am seeing a lot of NTP updates in the logs:
system.log:Nov 2 19:18:26 mightymac ntpd[34353]: time reset +0.280424 s
system.log:Nov 2 20:26:10 mightymac ntpd[34353]: time reset -0.857206 s
system.log:Nov 2 20:26:10 mightymac ntpd[34353]: frequency error -589 PPM exceeds tolerance 500 PPM
system.log:Nov 2 21:01:15 mightymac ntpd[34353]: time reset +0.974976 s
system.log:Nov 2 23:00:28 mightymac ntpd[34353]: time reset +0.557037 s
system.log:Nov 2 23:34:56 mightymac ntpd[34353]: time reset +0.960510 s
system.log:Nov 3 09:49:37 mightymac ntpd[34353]: time reset -1.004375 s
system.log:Nov 3 10:07:17 mightymac ntpd[34353]: time reset +0.491741 s
These are big jumps - a second, half a second, much more than I'd expect to see. Given it's happening on a colleagues machine we can rule out my clock battery or other local hardware/software issues, it's happening both when I'm at work and at home (on two different networks), and it's only happening since the summer time change on Sunday.
Has anyone else seen this? This is on 10.6.4, on two machines that have not been rebooted since the clocks changed.

I have a similar problem - when I start up my clock has advanced about 13 hours. It seems to have been doing this since daylight savings changed. It has the right time zone and I have unlinked synchronisation but it keeps happening even when it is locked.

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