Thanks so much everyone for your input. For anyone interested, I asked some people on Twitter and got the following responses.

@rmurphey (Rebecca Murphey): @stevenklein JavaScript Patterns and Object Oriented JavaScript would be next on my list

@thomasfuchs (Thomas Fuchs): @stevenklein http://javascriptrocks.com/performance/ :)

@paul_irish (Paul Irish): @stevenklein what rmurphey said and also zakas's high perf js