(ok, not every show, just every show I cared about this week, besides Lost whose entire format screws with time)
There are spoilers for:
Smallville 5.10 "Fanatic"
SG1 912 "Collateral Damage"
SGA 212 "Epiphany"
BSG 212 "Resurrection Ship, part 2"
but really, really, really minor ones
SV: Teaser...credits...48 Hours Earlier
SG1: Teaser...credits...24 Hours Earlier
BSG: Teaser...credits...48 Hours Earlier
SGA: ok, no "xx Hours Earlier", just an entire ep where time in a certain place goes at a different speed than that of the rest of the world.
Honestly, this distracted me pretty much throughout the entire 6 hours I had SFF on TV.