Conditional Comments are the name of HTML style comments that contain conditional directives for the browser. They are for IE only and thus are often employed in dealing with IE only CSS bugs like so:
<!--[if lt IE 7]>
<style type="text/css" media="all">
@import url(http://example.com/IEFixes.css);
</style>
<![endif]-->
This article gives good examples and provides a link to the official Microsoft document.
To make a program execute automatically when a CD is inserted, create a file called AUTORUN.INF in the root of the CD and in it put:
[autorun]
open=setup.exe
This will launch setup.exe from the root of the CD.
These two articles address the main security issues the one should be considering when writing Perl Scripts that will be publicly available and possible remedies.
Security Issues in Perl Scripts
Security Issues in Perl Scripts: Perl Taint Mode
Both of these are by Jordan Dimov
Koders is a source code search engine. It indexes over 125 millions lines of code from open source projects in 16 different programming languages.
This is very useful when you have read about a function or operator and want to know how it is used in real life or simply to see if a more efficient way exists.
Being a CSS newby, I found this lesson to be useful in understanding, via code snipets, how CSS layouts works.
More info on the topics from the same site can be found here.
Color Blender allows you to pick a colour value format, input two valid CSS colour values in the format you chose, and pick the number of midpoints you'd like to see. The palette will show the colours you input as well as the requested number of midpoint colours, and the values of those colours.
After having to do this by hand once, I find this rather useful. You can also use it offline or on you site if you want, be sure to respect the Creative Commons license (Attribution-ShareAlike 1.0)
From the National Institute of Standards and Technology, the Dictionary of Algorithms and Data Structures contains descriptions and definitions for an incredible variety (over 1200) of algorithms. Some also include implementation examples, sometimes in pseudocode, sometimes in a real language like C, java, Perl, etc.
If you ever need to parse a comma separated string with double quoted text fields (something that looks like this: "name","email",,"postal code",,,,, ) in Perl, the Text::ParseWords module is a life-saver, especially the &parse_line function.