Discussion forums are needed when you are looking for help and sometimes help isn’t available on sites (like: when you Google) in the way you need. Discussion forums are like heaven for a coder when it comes to solve confusing problems. I have compiled a list of some famous programming forums that will always help you:

.NET Framework

image MSDN forums
General forums about C# programming

image  ASP.NET forums
forums about ASP.NET

image

 Silverlight forums
officialy from Microsoft

 image Official IIS forums

 

PHP

image  PHP freaks 

image PHP Builder forums

image  Devshed php development forums

image Weber forums

imagePHP free chat forums

MySQL

image MySQL offical forums

 

Ruby on Rails

image Rails forum

 image  Ruby forum

 

Java

imageSun forums Sun’s official Java forums

imageDZone Forums

 

Update:
Oh! How I forgot this one: (thanks to Imran)

image

Stackoverflow
For all kind of programming Q and A.