Mailing Lists Gmail

How do you add a list of e-mails to a Contacts list in Gmail?
I have to add a list of emails to the Contact list, so I can therefore send e-mails for a school clubs. I have a long list, but I was curious of how to add a long list of e-mails at once, instead of adding each e-mail address one-by-one.
You create the list in Microsoft Excel like this.
http://mail.google.com/support/bin/answer.py?hl=en&answer=12119
http://www.dailydoseofexcel.com/archives/2004/11/08/creating-csv-files/
Make sure that when you are saving it (File > Save As), the file name ends with .csv or Comma delimited. The default is Microsoft Excel Workbook (XLS) so you have to click the drop down arrow to choose CSV among the list of types.
Once you’ve saved it, follow this article.
http://mail.google.com/support/bin/answer.py?answer=14024
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