Welcome! As you can probably tell, I'm a big fan of simple, text based user interfaces. If you're looking for an exciting, dynamic, graphics-intensive page I'm afraid you won't find it here. Instead, you will find a bunch of really interesting stuff that won't take hours to download (I'm on a dial-up modem myself).
I've spent quite a bit of time studying the music of Iannis Xenakis and I find his artistic aims to be most closely aligned to my own. His book, Formalized Music published by Pendragon Press, is a quite obfuscated treatise but is currently the most comprehensive outline of his compositional technique available (I hear from a friend at CCMIX that a book containing new material is due to be released soon). One of the most interesting chapters for me concerns the use of computers for assisting with calculations. Some editions of the book contain the complete FORTRAN IV source code which I think is an invaluable resource. I have ported this program to modern Fortran 95 so people can get an idea of what the original output would have been. You can get it here.
I've tried to retain the original code as much as possible which includes leaving the spaghetti structure intact. The intention is simply to get it working, not to modernize it for beauty and efficiency. As it is, it runs almost instantaneously on a 1.7GHz desktop computer rather than a six month batch job, so I think that modernizing it would defeat the purpose of this project.