Announcing Google Reader Alerts
blog.pagerduty.com
blog.pagerduty.com
http://www.ietf.org/rfc/rfc1149.txt
Currently the product depends far too heavily on every engineer having some kind of electronic communication device, which is clearly unrealistic for some companies.
I used to run Reliable Response who made Notification. It was basically an enterprise PagerDuty. Enterprise when SaaS was taking off...thus why I used to run Reliable Response. But, seriously, it supports an RSS feed of your recent alerts.