Pokerstars' new hand replay...
As small as this may seem to some I believe the main thing that Full Tilt had up on PS was the instant HH. I just noticed a red "previous" icon in the top left of the table, and investigated to find a hand history replay option.
I don't know exactly how "new" this is, as i've been deprived of the internet for ~4 days, but i'm so happy to see PS added on to it's hand history display.
Just figured i'd share in case someone else out there can't wait to check the HH's after every showdown. It seems that PS delivers once again.