Active learning has made a big comeback since Socrates popularized it around 490 BC. The following links provide information on various techniques for anyone seeking to incorporate active learning in their classroom.
A good introduction to active learning by Bonwell and Eison.
This webpage contains summaries and a bibliography of articles written on active learning.
A pdf document by Pamela Harris & Ralph Johnson of Montana State University that discusses various strategies for teaching and learning.
Specific Methods of Active Learning