Love Christina.
Love Bailey. She was like a 5-year-old, the way her eyes lit up during the surgery she had never seen done before.
Sloan/Little Grey thing. Saw that coming. Not sure how I feel about it yet.
I agree that this Izzie thing needs to go somewhere. It's getting old. And is it just me or is Denny starting to become an a-hole? He's all mad about Alex and it's kind of making ME mad. He used to be this sweet guy who was all dead, and would just touch Izzie in the hall as she passed without her knowing (the end of the season 3 finale was the best Denny part ever). I understand this if Izzie's sick, but could we please figure out what's wrong with her... quickly.
But I love Alex. I'm surprised he still picked Izzie to do the solo surgery with him... and that he told her he loves her. Good for him, but obviously Izzie is in love with a dead guy, so it'll never work out

I see something bad/weird happening during the surgery next week, causing everyone to figure out that something's wrong with Izzie. Hopefully.
Callie's storyline is just becoming annoying. I was so thrilled when Hahn left so that this awkward sexual tension (and Callie's questions about how to pleasure a woman) would stop. But now it's starting again. ahh!