I'm still not sure why Jafo232 sold the usefulness of his hack a bit short by choosing this title:
Auto Post Google Alerts.
It's actually an email gateway to vBulletin thread creation! The email doesn't have to be from Google or an alert at all. It checks a mailbox, and creates a new thread from emails received there. So maybe it'll work for you, TheMusicMan!
For the record, this hack uses POP, but requires that your version of PHP be compiled with imap support. That's why I had troubles with it; but it works for other people. I say, give it a shot.
As for me, what I'm doing to achieve the same effect (being able to post threads easily from the road) is I set up an RSS blog site, and use ArticleBot to fetch those and start threads from the feed. I use hBlogger on a Treo 650. What's nice about this strategy is that it can even post attached images inline.