taxonomy query language: filter views by vocabulary term

Views are great for classifying content by type, author, date, but they do not allow filtering by vocabulary term.
The default presentation for vocabulary terms is a link that will then present you with all the content that matches this term more or less unclassified.
The Taxonomy Query Language fills that void.
It complements the views user interface with filters for each vocabulary you've defined, allowing to only get nodes that match a given keyword.