The document discusses four advanced skinning techniques in DotNetNuke 5: 1) Style attribute clean-up using the StyleScrubberWidget to remove hardcoded styles. 2) Content positioning for SEO using the RelocationWidget to move content for better page ranking. 3) CSS automation using LESS to simplify CSS creation through variables, mixins, and nested rules. 4) CSS class injection using jQuery selectors to dynamically apply classes for advanced styling. It also presents Skinfigurator as an open source solution to make DNN skins more configurable through rule-based selection based on roles, site sections, and other criteria.