A couple more ideas for you.
If your arms/lats are totally fried from pullups, consider looking through the archives for a more leg or ab oriented WOD and substituting it. I think each WOD is a gem so occassionally mixing up the order to suit you is fine.
Although there is a lot to be said for sticking to the program as written, you will find smart subsititutions and personalization will help you avoid burn out.
Also keep reading the comments and boards for sub ideas and learning how to scale down the workouts while still keeping them intense.
Best of luck.