Jon, I don't think you should feel too bad about it. After all, I notice that Dick Greenhaus, our Ultimate Guru, double-posts quite frequently. Of course, his messages are always worth reading twice....
I think the trick is that you have so click on the "submit message" just once, resisting the temptation to double-click. Then you have to wait until the message posts and you are taken back to the conference thread listing. It could be that you can use the "back" button or the "conference thread listing" link after you've submitted your message, but that's the sort of thing only Max understands. Seems to me things work best for us amateurs if we click the "submit message" button just once, and wait. Take a beer break if you have to wait too long. It's a good reason for a beer break, isn't it?
-Joe Offer-