The OSR, for those of you in Rio Linda, is the Old School Renaissance . It is a rebirth of that Ole Time Religion fun that Dungeons & Dragons used to be.
Coasters Castles Combustion defines the OSR -Old School Renaissance, as "a surge in popularity of previous editions of D&D. Common themes are are megadungeons, sandbox campaigns, and an emphasis on player rather than character skills. Matthew J. Finch's A Quick Primer for Old School Gaming articulates many of these concepts quite well."