Hello,
I have created a plugin called zpImpMail that allows Zen Photo to import photos and videos from emails as attachments. I've been using it myself for a couple of months with my iPhone and it seems to do the trick. It's been tested with version 1.2.9 plus the current nightly build. If anyone is interested, I have setup a page for the plugin at: http://www.monkeypen.com/2010/04/mail-import-plugin-for-zen-photo/
I just posted a new version that is updated to be Zen Photo 1.3 compatible. Anyone using the original version of the plugin with Zen Photo 1.3 will have their utility button disabled, so updating to the new version solves the problem.
http://www.monkeypen.com/2010/04/mail-import-plugin-for-zen-photo