Thanks - that is the easiest way, but only works if you want your entire site in https (https vastly slows down your site so I would almost never want that).  I need only one page to be https.  Redirecting TO https is no problem:
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^(contact/requestBook)$ https://s24863.gridserver.com/$1 [R=301,L]
Redirecting back FROM https when you go to any of the other sites is what doesn't work - i either get an endless loop (resulting in apache failing) or it stays in https all the time:
# Redirect non-secure pages to HTTP if requested by HTTPS
  RewriteCond %{SERVER_PORT} ^443$
  RewriteCond %{REQUEST_URI} !^contact/requestBook$
  RewriteRule ^(.*)$ http://s24863.gridserver.com/$1 [R=301,L]
It has something to do with the way drupal rewrites urls - going to https the url is one thing but by the time it gets to the next condition (on the following line) to rewrite back to http if necessary it thinks it's something else.  so while it matches contact/requestBook as the request URI it won't match NOT contact/requestBook for the return url.

I still haven't gotten this working and the securepages maintainer says he can't reproduce the problem with the module.  And the site goes live very soon.  I've seen many issues posted both on the drupal.org forums on problems with the apache solution above as well as on the module page for the maintainer - so I believe it has something to do with clean urls or someething like that and that there IS a solution - I just can't figure out what it is.

Thanks
.sander


Chris Johnson wrote:
Your situation may be vastly different from ours, so this may be of no
help at all.  But here is how we redirect HTTP to HTTPS for our sites
using Apache 2:

<VirtualHost *:80>
    ServerName  www.example.com
    Redirect    /   https://www.example.com/
</VirtualHost>
  

--

sander-martijn
interface developer | architect
sander@sander-martijn.com
www.sander-martijn.com