Encyclopedia of improv games, improv terms, formats, and references. Whole site can be downloaded as a PFD booklet.
Improv Encyclopedia is the largest collection or resources for improvization theater on the web. Here you will find tons of stuff related to improvization theatre.
For those not particularly looking for improv-related material we feature:
Icebreakers: games or activities that help "break the ice" at events where there are lots of people who don't know each otherWarm-ups: games to get people in a playful moodgames and exercises to promote group Group Trustexercises and games to encourage Spontaneitylots of drama and theater Games
Via Ariana Amorim