I want alert to be sent to multiple users.

Q: I want alert to be sent to multiple users. "Alert Me" doesn't help!

One way is to use "Alert Me" option. If you are using Outlook, use Tools > Rules and Alerts > New Rule to create a rule that will automatically forward the email to other people.
Update: This post was written long ago when there was no MOSS or WSS 3. Managing alerts for different users was not possible OTB. So, this simple technique provided a way to the users to forward the important news to the other users. for example, users used "Alert Me" to subscribe to the site messages and in the outlook created a rule to forward the received email from SharePoint to the group of other users who had not subscribed to the site news.
SSA