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What Language....
I would suggest: Python Using easygui.py in python to make GUI Visual Basic (somehting like express studio 2005)
But this is generic and not for everyones taste, I would suggest always learning assembly in your spare time nothing major maybe reading over a tutorial or using pic's and learing ASM for PIC, there are ususally only a few htings to learn (try it on freebsd with nasm) and it's fun but takes a while to do anythign worth while with just gives you a better understanding of computers.