In case you weren’t aware, there has been some changes to the way Magento 1.1 works, and it’s highly important that you fix your issues before you go live with the final release of Magento 1.1, so I’ve compiled this helpful guide to upgrading your themes for new Magento releases, which I expect will be used with future releases as well as the current release of 1.1.
So far, the article details one major change which has to do with category and product pages, where helper calls have been replaced with actual function calls, and includes a couple minor changes within layout blocks.