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
MSDN forums
General forums about C# programming
ASP.NET forums
forums about ASP.NET
Silverlight forums
officialy from Microsoft
Official IIS forums
PHP
Devshed php development forums
MySQL
Ruby on Rails
Java
Sun forums Sun’s official Java forums
Update:
Oh! How I forgot this one: (thanks to Imran)
Stackoverflow
For all kind of programming Q and A.