diff -uN /home/guerry/elisp/testing/org/org.el /home/guerry/elisp/testing/org-4.56/org.el
--- /home/guerry/elisp/testing/org/org.el	2006-11-22 08:40:48.000000000 +0100
+++ /home/guerry/elisp/testing/org-4.56/org.el	2006-11-17 08:53:16.000000000 +0100
@@ -5359,11 +5359,9 @@
 	   (pattern (buffer-substring-no-properties beg end))
 	   (completion (try-completion pattern table confirm)))
       (cond ((eq completion t)
-	     (cond ((equal type :opt)
-		    (insert (substring (cdr (assoc (upcase pattern) table))
-				       (length pattern))))
-		   ((equal type :tag)
-		    (insert ":"))))
+	     (if (equal type :opt)
+		 (insert (substring (cdr (assoc (upcase pattern) table))
+				    (length pattern)))))
 	    ((null completion)
 	     (message "Can't find completion for \"%s\"" pattern)
 	     (ding))

Diff finished.  Wed Nov 22 08:46:56 2006