WikiAlarm

Shucks, this looked so promising....I thought I'd finally found a service that would wake me when Wikipedia articles of my choice had been updated! Dream on. What it does do, however, is send you an email alert when selected articles are edited. And furthermore, we're told, you can

• Track unlimited pages
• Monitor your products & brand names as well as competitors
• Pages monitored every hour 24 hours a day 7 days a week
• Send the email alerts to as many people as you like
• Emails include full visibility on changes made

Don't let your company get caught out in a damaging online reputation management situation or even a Wiki Circularity disaster – signup to wikiAlarm today and safeguard your reputation on the Internet’s most popular information channel. 

I have no idea what a "Wiki Circularity disaster" is, and a bit of searching found no other reference to it, but it sure sounds terrible!!!

For emails alerting you to changes in any selected page, including Wikipedia pages, you could use Changedetection.com