The obvious sources are Mastering the Rubber Guard and Mastering the Twister (I use both!) but another one that is LOADED with sneaky moves is Karo Parysian's Judo for MMA. He modified his whole judo game for no-gi, so it translates really well.
The only actual advice I'd give would be not to abandon a move once you've "got it." Keep drilling it too. We've got what we call the 10,000 Club where we keep track of how many reps of a given move you've drilled. Once you've done 10,000 reps, you've graduated kindergarden and can say that you know the move. Then you try to drill the next move 10,000 times. Doesn't sound like much, but you'd be surprised how few reps you actually do in a given session, or even a given month.