Thread: What Should I Learn Next?

I'd say there's no point in learning perl or ruby unless you've got some special reason to, since you already know one general purpose scripting language and two web-oriented scripting languages. Also .Net isn't a language, it's a framework or platform, kinda like Java virtual machine. C# code is compiled to a .Net program (though theoretically there's nothing stopping anyone from making a compiler that compiles to native code).

I might suggest you work a bit with databases and SQL. It's a nice thing to know, and it's really needed for bigger web-applications, so maybe it'd be nice to have a fuller picture of that scene.

Other than that, if you want to develop graphic applications or small games, you should probably go with Java or C#, as it's an easier place to start. However these won't be true stand-alone programs, as the person running them need the Java Virtual Machine or .Net framework to run them.