<p>Now that I know <code>C++</code> I want to get into desktop application that have a UI instead of <code>Command Prompt</code> stuff, where should I start?, and what are some good <strong>online</strong> resources?</p>

I use
Codegear
's C++ Builder. It's C++ language support is not 100% but it more than makes up for it by having a great two-way RAD IDE and the ability to use a huge library of existing Delphi components.