How often do you send an email an forget the attachment? After years of doing this, I noticed that Entourage's rules have an Outgoing section. I added a rule, with two criteria, 'message body contains: attach' and 'attachment: does not exist,' with the corresponding actions of 'display dialog: you may have forgotten the attachment,' and 'move message: Inbox.'
This sort-of works, but I'd really like the dialog to offer 'send/don't send' as the options, so that you have better control. Any volunteers to take this forward? Entourage rules allow you to launch an AppleScript as the action for a rule, so that's a possibility, if only my AppleScript was any good.
Mac OS X Hints
http://hints.macworld.com/article.php?story=2006030605540720