From mboxrd@z Thu Jan  1 00:00:00 1970
From: Memnon Anon <gegendosenfleisch@googlemail.com>
Subject: Re: Exclude tag from custom agenda
Date: Sun, 9 Dec 2012 15:59:48 +0000 (UTC)
Message-ID: <871uezql9d.fsf@mean.albasani.net>
References: <2012-12-07T18-18-52@devnull.Karl-Voit.at>
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Karl Voit <devnull@Karl-Voit.at> writes:

> What I want to achieve: on top, there should be my normal agenda
> (events, tasks, habits, ...) but minus elements tagged with
> "reward".
[...]
> I think, that «(agenda "" nil)» has to be modified but I don't know
> how.

I'm in a hurry, but lets see if I can give you something in 5 minutes.
We need a skip-by-tag function. gmane should help here
<<search...search>>

Mike McLean posted one in 2011, which still seems to work.
Lets make that a little more general:

#+begin_src emacs-lisp
;;; Based on http://article.gmane.org/gmane.emacs.orgmode/41427
  (defun my-skip-tag(tag)
    "Skip entries that are tagged TAG"
    (let* ((entry-tags (org-get-tags-at (point))))
      (if (member tag entry-tags)
          (progn (outline-next-heading) (point))
        nil)))
#+end_src

Now, (agenda "" nil) should be:

#+begin_src emacs-lisp
(agenda "" 
 ((org-agenda-skip-function '(my-skip-tag"reward"))
  (org-agenda-overriding-header "Agenda (without rewards: ")))))
#+end_src

That should do it.
Please give it a try :)

Memnon