I say /ofn/, and always regarded /oftn/ as substandard (until I become a proper linguist who doesn't make such pernicious judgements hem-hem).

this intrigued me, b/c i would've thought the opposite; i always pronounce the T and i'm not sure i've heard it the other way except perhaps from a child.

what about "February"? i pronounce the "r" that immediately follows the b, although it's so quick that you might miss it. definitely there, though. is the silent "r" considered a 'linguistically correct' alternative?

also, how about "wednesday"? i say 'win-s[t]ay', but it's always bothered me b/c it seems it should be pronounced something more like weddin'-s[t]ay. any thoughts?