Add your Mac to a Windows WorkGroup

Following are my experience for adding the mac os x (Leopard) to the work group of Windows.

i) Go to System Preference-> Network
ii) Create new location and select advanced options.
iii) Go to WINS Tab and select your work group and save your preferences.

To enable file sharing with windows PC :

i) Go to System Preferences -> Sharing.
ii) Check the File Sharing and go to options in the file sharing.
iii) Check the SMB File sharing option.
iv) Give a password if required (this will be used when the other user would like to access, login into your account for sharing files)

Also don't forget, to enable your user account for windows sharing in the Account Preferences