WARNING
DO NOT clone this as it has dependencies on an unreleased Spree extension.
SUMMARY
This Spree extension generates dynamic, seo-friendly sitemaps on the fly in XML.
This extension is NOT compatible with the static_content extension.
In order to avoid an SEO penalty for duplicate content, products are only listed once at /product/productName
For Rails 3 and Spree >= 0.50.0
INSTALLATION
gem 'spree_dynamic_sitemaps', :git => 'git://github.com/asha79/spree_dynamic_sitemaps.git'
bundle install
Hat tip stephp for doing all the heavy lifting with her spree-sitemaps extension.