Christopher Pitt shows us how we can use RulerZ, the PHP rule engine, to smarten up playlist song selection by applying constraints and filters!
Using the RulerZ Rule Engine to Smarten up Playlist Building
CMS Content Organization Structures: Trees vs Facets vs Tags
Lukas Kahwe Smith discusses CMS Content Organization structures, comparing Trees to Facets to References to Tags. Running a CMS? You need to read this.