I know I can email my phone directly by sending an email to :
(MYPHONENUMBER)
mobile.mycingular.com
I'm sure you can find this info for your provider.
You can script thios address into anything that's able to send email.
I use this address for my email in WebCalendar (Fantstico script) and it sends me reminders.
Be careful about the size of mailed messages!
-p