Today I created a little (~450loc) extension for the official node.JS api page. It's a client side Live-Search: filters over content and navigation as you type.
Feel free to try it out at http://dracoblue.net/showcase/enhanced-node-api/.
This is made 100% javascript (with jquery) and does not change the api.html at all.
Source is available at enhanced-node-api@github.
Comments appriciated!