Do you adhere to a certain coding style or standard when programming in your language of choice? If you are not following an official coding standard or a standard set-forth by your place of employment – perhaps you should start.
Why follow a coding standard? Standardize coding practices allow code to be more easily read by other programmers. Just imagine if you inherited code that was labeled as follows:
string b;
int flag1;
int flag2;
This might look like the code you wrote when you wrote your first program. However, if you saw this coding style in a professional environment you might have a difficult time understanding the meaning behind the variable names.
Coding standards are not necessarily dictated by the creator of the language. Many have just evolved into standards among the programmers who use the language.
I have compiled this list of several coding standards and styles. If want to start adhering to coding standards, I suggest you start with the official standards (if available). Also, check with your organization to see if they have a coding standards document already created.
.NET (C#/VB.NET)
- Design Guidelines for Class Library Developers
- C# Coding Standards and Best Programming Practices
- C# Coding Standards and Best Programming Practices (.doc)
- C# Coding Standards Document
- VB.NET Coding Standards (.doc)
- .NET Naming Conventions and Programming Standards
PHP
C/C++
Python
Java
Ruby
HTML/CSS/Javascript
- HTML Coding Guidelines
- CSS Coding Standards (via coffeepowered.co.uk)
- CSS Coding Standards (via drupal.org)
- CSS Coding Conventions (via phpied.com)
- Code Conventions for the JavaScript Programming Language
- JavaScript Coding Standards (via drupal.org)
- JavaScript Coding Standards (via brevardcounty.us)
Objective-C
If I left out your favorite programming language, check out the Coding Conventions for languages at wikipedia.
Do you know of any other coding standards resources that I should include in the list above? Please share in the comments.

Another good one: Google Javascript style guide.
Actionscript: http://www.adobe.com/devnet/flash/whitepapers/actionscript_standards.pdf
Perl Best Practices
http://oreilly.com/catalog/9780596001735
OpenBSD style(9) for C code
The GNU Coding Standards:
http://www.gnu.org/prep/standards/standards.html
Google C++ Style Guide
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml
Probably the best source for .net developers:
Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries (2nd Edition)