Because of dissociation, I often lose chunks of sessions, too. Like Tree, I'm glad to see that I seem to be internalizing what goes on, regardless of whether I can consciously remember.

Two things have helped me: one, I review sessions with T right before I leave whenever possible--he tells me the 'big idea' we discussed. Two, I keep paper and a pen in my bag so I can go out to my car and jot down whatever I do remember immediately afterwards. If I wait til I drive home, it's all gone from my head. I find these notes really helpful when I'm preparing for the next session--it helps me feel the thread of continuity that I otherwise often miss.