Google has a service called Alerts that will monitor News, Blogs, Web, Videos, Groups, or aggregate of all five.

When you set up an alert, you choose terms to follow, what you want to monitor, the frequency at which you wish to receive the alert, and enter an email address to send the alert to.

When your terms and the type of post you are monitoring is discovered by the service, an alert is sent to the email address you've assigned to the alert.

Nonprofits (and others) can use the Alerts to:

I've been using Montastic for about eight days now. One of the things I appreciate about the service is the ability to add multiple emails to be alerted when there is loss of service. I currently have a message going to two of my email addresses and it will also send an IM to my cell phone. Montastic can be a little squirelly--it registers false positives when there isn't an immediate response from the server it is checking on. Still, it provides amazingly good service for something free.

Last night it and SiteUpTime.com detected the TechSoup site as being down. Interestingly, the two services showed different amounts of downtime.