I sync my PPC regularly with my desktop. I've sequentially applied the XP DST patch, then Outlook Time Zone Update Tool and finally the DST2007FallUpdate.msi (as per http://www.microsoft.com/nz/windowsmobile/daylightsaving/default.mspx#followsteps) yesterday and my PPC's still on pre-DST. In fact it's stuck on pre-DST: I can of course manually change the time on the PPC, but after syncing it returns to pre-DST (despite the desktop being on DST).
Most bizarrely, my appointments in Calendar on the PPC are of course an hour out as expected, but when I try to adjust them on the PPC, they show up at the right time (e.g. appointment supposed to be 1400, shows up as 1300 pn the PPC, but when I try to edit it on the PPC, shows up as 1400!).