Bjorn - firstly i apologize for being too lazy to pull out the character map to spell your name properly:)
secondly - under Preferences->General->windows->Edit, there's an area called "Sending messages"
you'll see what i mean there
and don't worry, i went thru the preferences twice looking...
Bjorn
you can change the settings so that enter won't send the message
i have it so only ctrl-s sends messages because that's what icq accustumed (sp?) me to