Displays 6 Time Zones of your choosing, fully customizable
To install, place the Time_Zones.CAB file into the magical directory of:
C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\bin\
Then run the command (from the same directory):
stsadm -o addwppack -filename Time_Zones.CAB -url http://your_url_here -globalinstall -force
Then simply run an iisreset and your web part is ready to use. The full zip file includes the CAB as well as all the original code so you can modify it if you want. Otherwise, just download the CAB if you want to simply use the part, enjoy!