Recommend me some good language to learn

I already know the following:
C (both ansi and kernigan and Ritchie)
C++
X86 Assembly (masm)
Visual Basic 6
Visual Basic .NET
C#
J#
Java
HTML
Scheme
Perl
Bash (scripting)
Python
Lua
Sicp

>>23
Seriously. Try operator overloading in C. You certainly can overload C++ operators in C and even create your own operators that are not in C++. See what I mean by limiting.