I come across many great coding-related websites when learning how to do new things, so it seems like a good idea to share them here.

jQuery, Ajax and Javascript

jQuery Home Page
jQuery Fundamentals Tutorial
Marc Grabanski
JavaScript, jQuery and concrete5

SQL

SQL Examples

C#

C# is my favorite programming language, it can be used to code all kinds of applications and is not hard to master IMO.
Code Project – great example projects here
C# Examples – nice, concise examples of how to solve common C# programming tasks
Me On Stack Overflow – this site is the perfect place to ask programming questions