if you decide this way u have to load wordpress environment variable to zencart
add this line require_once( ‘wp-load.php’); to application_top.php (i dont know zencart equvalent so i wrote to osCommerce).

after this small change you can use all wordpress variables functions and classes in you zencart (if you placed your zencart files correctly.)

for efficient integration use WordPress user routines instead zencart’s, and use WordPress custom post_type as add product.

i hope this short info helps u

I found your site here: http://www.sitepoint.com/forums/ecommerce-5/wordpress-zen-cart-771109.html

This looks really great, I am also trying to integrate an ecommerce system into my wordpress site to sell items. If you have any advice or information that could be helpful for me, perhaps some links to what you read, etc. That would be a great help.

Anyway thanks for reading this message if you receive it, the site looks great and I think that it would work well for me.