[Jayk]

Just a minor change in the modification for modules/Froogle/froogle.php for X-Cart 4.1.6:

-----------
Find Code:
-----------

if ( !defined('XCART_SESSION_START') ) { header("Location: ../../"); die("Access denied"); }

------------
After, Add
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############################################################
# X-CART-SEO Mod :: http://code.google.com/p/x-cart-seo/
############################################################
if (!empty($active_modules["XC_SEO"])) {
	include $xcart_dir."/modules/XC_SEO/loader.seo.php";
}
# END SEO

This next part is the part with the small change:

-----------
Find Code:
-----------

			# Post string
			$post = func_froogle_convert($product['product'], 80)."\t".
				func_froogle_convert($product['descr'], 65536)."\t".
				$froogle_location.constant("DIR_CUSTOMER")."/product.php?productid=".$product['productid']."\t".
				$tmbn."\t"

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Replace With
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############################################################
# X-CART-SEO Mod :: http://code.google.com/p/x-cart-seo/
############################################################
# The following has been commented out and replaced
#
#			# Post string
#			$post = func_froogle_convert($product['product'], 80)."\t".
#				func_froogle_convert($product['descr'], 65536)."\t".
#				$froogle_location.constant("DIR_CUSTOMER")."/product.php?productid=".$product['productid']."\t".
#				$tmbn."\t".
#
# SEO replacement code begin
#
			# Post string
			if (!empty($active_modules["XC_SEO"])){
				# Build SEO URL
				$prod_url = $seo->_product_callback(array(false,'','productid='.$product['productid'],'',''), true, $product['product']);

				$post = func_froogle_convert($product['product'], 80)."\t".
					func_froogle_convert($product['descr'], 65536)."\t".
					$froogle_location.constant("DIR_CUSTOMER")."/".$prod_url."\t";
			}else{
				$post = func_froogle_convert($product['product'], 80)."\t".
					func_froogle_convert($product['descr'], 65536)."\t".
					$froogle_location.constant("DIR_CUSTOMER")."/product.php?productid=".$product['productid']."\t";
			}
			$post .= $tmbn."\t".
# End SEO

This is working on my store. The changes to includes/func/func.core.php seem to be unnecessary in 4.1.6. The includes/get_language.php file is different in 4.1.6 than it was in 4.1.3. I don't have the language selector enabled on my site, so I can't confirm the effect of not modifying that file.

Hope this helps someone.

Cheers,
Jason