See: http://developer.apple.com/techpubs/macosx/Essentials/SystemOverview/InverEnvironissues/chapter_14_section_9.html

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The link above is dead, but info available here: http://developer.apple.com/documentation/CoreFoundation/Reference/CFMessagePortRef/Reference/reference.html

Note: CFMessagePortSendRequest leaks memory if you pass NULL for replyMode (10.4.3 and later?). Pass kCFRunLoopDefaultMode instead.

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Has this be logged in Radar? Is it fixed on 10.5?