pretty simple - textarea's should start out empty (barring the html specifies contents), but konqueror starts them out with a space. For instance, any bugzilla entry has the textarea and the html has nothing (not even a space) between the opening and closing tags of the textarea. mozilla correctly has a textarea with no initial contents, konqueror starts out with a space in the text area (an annoying once if you're pasting stuff :)
Fixed in Fedora Core 3.