jeez, what's with the desperation of getting through as many programming languages as you can in shortest amount of time?
Isn't it better to sit down and just learn one language, and use it for at least a year? No, you can never get the nuances of a language by just sitting through a 15 min tutorial, no matter how steeped you are in computer science, as every language has certain new features you haven't seen yet (in the case of C, a certain restriction).. For example, can you honestly tell me that you can master Templates in C++ in 15 mins? Or what about Lisp Macros? So, please, sit down with your favorite language and start exploring, it might just be interesting to learn the inner working of one language rather than learning how to write the next java-acounting-program..