Once the data is served there's not much you can do. But it depends how your site consumes the data. Straight html is pretty easy to grab, ajax calls make it mo

Once the data is served there's not much you can do. But it depends how your site consumes the data. Straight html is pretty easy to grab, ajax calls make it more painful (not necessarily difficult), HTML datastorage, a little more obscure but still available, my personal favourite is global javascript objects filled at runtime, accessed when necessary. Data can be obfuscated and links constructed on the fly.