I've seen several questions on the forum about blogging or posting via email. I also wanted to know how to blog or post from my cell phone since I'll be on a road trip without computer access soon.
So for anyone else who is interested, I found a make-shift solution through Flickr. More details are here: http://www.flickr.com/get_the_most.gne#blog
Basically, you set up the connection to your blog in Flickr and you get an email address from them - something like "let##[email redacted]" - and then you can send photo messages from your camera phone to this email address, which will automatically post the message on your blog as well. The email subject becomes the post title and the text + photo become the entry itself.
Downside: this won't work with just text. If you don't send a picture of some kind, Flickr won't accept it and nothing goes on your blog. Maybe someday WordPress.com will take pity on those of us who want email blogging, but until then this is one solution. If anyone figures out a way to just email text to your WordPress.com blog, let me know!