Org-Mode S-expressions

[jadamson@partners.org (Joel J. Adamson)]

Howdy,

I'm using Emacs 23.0.0.1 on Slackware Linux 12.0.

I'm trying to set up a unique Org Mode situation here.  I work for two
different researchers, with specific sets of projects for each one.  I
work for Researcher A Monday and Tuesday, and WEdnesday until Noon.
Then I switch over to Researcher B until the end of Friday.  I'd like
these to show up in the Agenda at the specified times and repeat every
day at the appropriate time.  I tried timestamps like

<2007-10-08 Mon 9:00>--<2007-10-10 Wed 12:00>

And the latest is diary-style s-expression, based on one I found in
the Emacs manual for diary:

<%%(let ((dayname (nth 7 (decode-time (current-time))))
         (hour (nth 3 (decode-time (current-time)))))
     (or (memq dayname '(1 2))
         (and (equal dayname 3) (< hour 12))))>

Now, I noticed that the angle-brackets and less-than sign will
probably mix things up.

What's the most effective way to accomplish this?  Please point me to
the best tutorial or explanation for timestamps.

Thanks,
Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109