Paul Lussier wanted to know how to interactively prompt for a value and use that value multiple times in org-remember-templates. His example is:

(setq org-link-abbrev-alist
      '(("RT" . "https://rt/Ticket/Display.html?id=")))

(setq org-remember-templates
      '(("Tasks" ?t "* TODO %?\n  %i\n  %a"            "~/organizer.org")
        ("Appts" ?a "* Appointment: %?\n%^T\n%i\n  %a" "~/organizer.org")
        ("RT"    ?R "* [[RT:%^{Number}][%^{Number}/%^{Description}]]" "~/org/rt.org")))

The version of Org on my system prompts for Number twice. We want to store the value in an associative list somewhere so that if Org encounters another prompt with the same text, it’ll use the stored value. Here’s a diff that’ll do the trick.

diff -u /home/sachac/elisp/org/org.el /tmp/buffer-content-4571Oz1
--- /home/sachac/elisp/org/org.el	2008-07-20 11:28:54.000000000 -0400
+++ /tmp/buffer-content-4571Oz1	2008-07-20 11:42:06.000000000 -0400
@@ -12822,38 +12822,52 @@
 	    (org-set-local 'org-remember-default-headline headline))
 	;; Interactive template entries
 	(goto-char (point-min))
-	(while (re-search-forward "%^\\({\\([^}]*\\)}\\)?\\([guUtT]\\)?" nil t)
-	  (setq char (if (match-end 3) (match-string 3))
-		prompt (if (match-end 2) (match-string 2)))
-	  (goto-char (match-beginning 0))
-	  (replace-match "")
-	  (cond
-	   ((member char '("G" "g"))
-	    (let* ((org-last-tags-completion-table
-		    (org-global-tags-completion-table
-		     (if (equal char "G") (org-agenda-files) (and file (list file)))))
-		   (org-add-colon-after-tag-completion t)
-		   (ins (completing-read
-			 (if prompt (concat prompt ": ") "Tags: ")
-			 'org-tags-completion-function nil nil nil
-			 'org-tags-history)))
-	      (setq ins (mapconcat 'identity
-				  (org-split-string ins (org-re "[^[:alnum:]]+"))
-				  ":"))
-	      (when (string-match "\\S-" ins)
+	(let (interactive-entries lookup)
+	  (while (re-search-forward "%^\\({\\([^}]*\\)}\\)?\\([guUtT]\\)?" nil t)
+	    (setq char (if (match-end 3) (match-string 3))
+		  prompt (if (match-end 2) (match-string 2))
+		  lookup (assoc prompt interactive-entries))
+	    (goto-char (match-beginning 0))
+	    (replace-match "")
+	    (cond
+	     ((member char '("G" "g"))
+	      (let* ((org-last-tags-completion-table
+		      (org-global-tags-completion-table
+		       (if (equal char "G") (org-agenda-files) (and file (list file)))))
+		     (org-add-colon-after-tag-completion t)
+		     (ins (if lookup
+			      (cdr lookup)
+			    (completing-read
+			     (if prompt (concat prompt ": ") "Tags: ")
+			     'org-tags-completion-function nil nil nil
+			     'org-tags-history))))
+		(if (null lookup)
+		    (setq interactive-entries (cons (cons prompt ins) interactive-entries)))
+		(setq ins (mapconcat 'identity
+				     (org-split-string ins (org-re "[^[:alnum:]]+"))
+				     ":"))
+		(when (string-match "\\S-" ins)
 		(or (equal (char-before) ?:) (insert ":"))
 		(insert ins)
 		(or (equal (char-after) ?:) (insert ":")))))
-	   (char
-	    (setq org-time-was-given (equal (upcase char) char))
-	    (setq time (org-read-date (equal (upcase char) "U") t nil
-				      prompt))
-	    (org-insert-time-stamp time org-time-was-given
-				   (member char '("u" "U"))
-				   nil nil (list org-end-time-was-given)))
-	   (t
-	    (insert (read-string
-		     (if prompt (concat prompt ": ") "Enter string"))))))
+	     (char
+	      (setq org-time-was-given (equal (upcase char) char))
+	      (setq time (if lookup (cdr lookup) (org-read-date (equal (upcase char) "U") t nil
+								prompt)))
+	      (if (null lookup)
+		  (setq interactive-entries (cons (cons prompt time) interactive-entries))
+		(org-insert-time-stamp time org-time-was-given
+				       (member char '("u" "U"))
+				       nil nil (list org-end-time-was-given))))
+	     (t
+	      (let ((text
+		     (if lookup
+			 (cdr lookup)
+		       (read-string
+			(if prompt (concat prompt ": ") "Enter string")))))
+		(insert (or text ""))
+		(if (null lookup)
+		    (setq interactive-entries (cons (cons prompt text) interactive-entries))))))))
 	(goto-char (point-min))
 	(if (re-search-forward "%\\?" nil t)
 	    (replace-match "")

Have fun!