I happened to find a very smooth way to e-mail my iPhotos from Entourage. If I have my unsent message as the topmost window in Entourage, I can simply drag a selection of photos from iPhoto to the Entourage icon in the Dock and they will get attached to the message.
I don't know if this is documented anywhere, but now at least visitors of this site now know. =)
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020510014529713