Marc Andreessen's cheat sheets

Here's a last minute project for your programming, IT, and web design classes: pick Marc Andreessen's brain. The founder of Netscape and one of the original authors of the Mozilla browser has his own blog (of course) and just released a list of his favorite websites for quickly and easily recalling "HTML, CSS, Javascript, PHP, and miscellaneous" code for a variety of programming needs.  Now as one of the key figures behind ning.com (a remarkably cool site that allows you to create your own social network for free), Andreessen describes the list himself:

There are a ton of free cheatsheets, quick references, and downloadable resources for programming languages and related technologies online -- in this post I've tried to organize and list some of the best for web development.

I've focused on HTML, CSS, Javascript, and PHP, since those are the languages we use most commonly at Ning, but many of these sites point to resources for other languages as well.

Many of the sites are pretty technical, but quite a few have a lot of good references.  There are also several meta-lists that provide links to many other sites.  This could end up being a real treasure trove for students (and teachers) looking for easy sources for the coding specifics we always forget, as well as resources for lessons on specific topics.