later tonight, daylight savings time in north america will end, one week later than usual. you can see some more details on the new DST start/end times on http://www.microsoft.com/time (this is a new URL reference for future references to DST/time zone changes/issues beyond 2007).
for a list of microsoft products that might be impacted, see the Product Impact Support page as well as the DST/TZ hot topics page. make sure your windows mobile devices have the correct information as well or if older, have had the windows mobile patch applied.
for developers, visual studio specific information can be found here:
as always, if you have questions, please let me know in the comments below or view my contact information for various ways to get in touch with me.