Fave episode: 8.05 Focus Attenuation, definitely.
Fave couples scene: not sure, but probably the Shamy double date/in the car. Or the baseball game.
Funniest scene: Back to the Future analysis.
Season 8 just started in the UK tonight, and it reminded me about the apartment flag - it was flying upside down at the start of the premiere. I like to think Leonard decided the apartment was in distress when Sheldon went walkabout.
Edit:I remember last season I was worried they wouldn't keep up the standard from S6, but then the first several episodes were brilliant. This season I didn't worry, but I don't think we've had the absolute best episodes of the season in the first few weeks. Don't get me wrong, I have no complaints and the episodes have been great, but I've got used to each season getting better!
I feel like/hope this season might be one that gets even better as it goes along.