Thanks for the pointers...
So this is what I tried.
1. Disabling all plugins.
2. Checking my .htaccess. It's standard WordPresss .htaccess.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
3. Changing permalinks to default WordPress permalinks option. Same.
4. New WordPress install, no plugins installed, install Yak. Same problem. See here: http://website-design-studio.net/finallinkA/?page_id=8
So all I have installed is YAK and it still don't work!
5. Same host... maybe it's a host thing... Dreamhost has a option to remove www. from domains which use.. perhaps this is causing the problem. Turned it off.. Also turned off "mod-security" whilst i'm here incase that was it. Same results.
I really love the elegance of the concept of using posts/pages as products in your solution Jason.
But this feels almost like a first date with a beautiful girl, it's gone well, you drop her off at her door, she's whispering nice things in your ear, giving you a peck on the cheek then saying good night.
Just frustrating.
So I'm struggling here... how would you start investigating such a redirect problem Jason?