I was happy to follow this first great talk by Axel Rauschmayer. It was well explained and corresponded to the tech-level I hoped for (reminding the basics, presenting the good patterns to use, and the trouble-shooting that can be met). The main idea that I noted is that Javascript has a big potential to be seen everywhere (client, server, desktop, mobile, database, ...), have a good understanding of its workings is capital nowadays (both for its potentials and limits).