This is done with old technology, but it still has such a wow factor I want to write about it.
You can easily update a website via SMS.
The middleman is Twitter. Set up a Twitter account (make it private if you want, but better keep it open!)
Set up your Twitter account to receive SMS text messages. Tweets are limited to 140 characters, which is conveniently the limit for SMS messages. I won’t explain how to set this up since the information is easy to find. Once it’s ready, SMS your status updates to the number for your region. (In Canada, text to 21212)
Set up your website to show your Twitter feed via the API. If you’re using Wordpress, grab one of many Twitter plugins. Now whenever you send your SMS messages they’ll appear instantly on your site. Format the feed however you want.