BubbleClock 

BubbleClock are analog clocks and reminder with semitransparent effect (only Windows 2000/XP). Various kinds of clock skins. Synchronization your computer clock.
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dfg AtomicTimeSync XP 

The program is a Time Synchronization Utility to synchronize your PC via the internet. It supports the 12 and 24 hours time format as well as all time zones. You can define an individual time offset and it works through Firewalls and proxy servers.
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TimeZone Expert world time zone clock 

-Show multiple time zone clocks in Windows taskbar.-Time converter for time calculations across Timezones.-Calculate working time overlap for different time zones.-Query more than 250 countries and 3000 cities time zone information .
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