Check for Event Daily, and Send Notification Messages

What is the best way to set up a system that checks for events daily and sends messages via email, Twitter, SMS, and possib开发者_如何学Goly Facebook? Keep in mind, that I do not have access to a web server with root access (Using Rackspace Cloud). Would PHP have a solution for this? Would there be any drawbacks to using Google App Engine and Python?

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If you are using Google App Engine with Python you could use "Cron" to schedule a task to automatically run each day.

GAE also allows you to send emails, just a little tip: make sure that you 'invite' the email address used to send mail to the application as an administrator so that you can programatically send emails etc.