Gmail has redesigned recently and I don't think it's bad at all. However, my Chat menu now 'fights' for his place with the Labels. That really makes navigation a pain. To quickly scroll through labels or through your users, sometimes you'll just pop up a screen that you didn't wish to. That's very retroactive, comparing the way things were before.
I really think there are other users having the same problem. I ask you to please consider redesigning the chat menu to be separate from the Label menu. Maybe on the right part of the screen, or below. I just really think that the labels and the chat are really mixing themselves and it makes the window extremely less dynamic.