I know HTML, basic Javascript, basic Java and basic Torquescript.
The HTML and Javascript really came in handy when my graphic design class had to make websites. I was able to venture out of the norm, while everyone else used tables with basic colors.
Although I did get everyone asking how I did it, some even asked if I could do similar things for them; and the teacher was warning me that if I roostered something up apparently my whole website would break. :|