Just like a bottle, you really want the keg to cool down to 40F or so for 2-3 days to allow the carbonation to dissolve into the solution. Otherwise, you are going to have super foamy, undercarbonated beer, because most of the CO2 will just be in the headspace of the keg causing disturbance.
Chill it for 2-3 days before your first pour!
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!