You will need to have a look at the information on posting via email on the WordPress Codex pages (http://codex.wordpress.org/Blog_by_Email). The plugin that I used is called Postie and more details can be found at: http://www.economysizegeek.com/wp-mail/.

The great thing is that this makes it easy to update a blog using a mobile with email functionality (just put the picture as an attachment) or you can use satellite phone such as the Iridium 9505A with data connector and a netbook such as the Asus Eee 901PC or a PDA such as the Hewlett Packard iPAQ.

If you are thinking about going the Iridium route (completely global coverage) contact Applied Satellite Technologies (www.satcomms.com) for more information and pricing.

Hope this helps,

Jamie