Unfortunately Richard Stanley hasn't updated the blog in more than 6 months, but in any case. If you want to sharpen your JS skills I'd highly recommend the site.
A while ago it was being promoted here on HN.
edit I'm laughing at the irony, not the claim of copyright infringment.
Nonetheless, thanks for putting this together!
I think there would be a great demand for people specialized in memory leak / performance tuning etc