I've been looking over the supported protocols in IP and noticed the following protocols:
I've used and been interested in VoIP for several years. It was really neat to see a precursor implemented in the 70's.
I had seen SCTP mentioned here and there but never really looked into it.
Here's a great overview: http://www.isoc.org/briefings/017/
Looks like it will become a widely used protocol at some point.
Learning about this stuff reminds me of when I was learning how to use DOS in the early nineties. I thought I was sooo cool because I was navigating directories and programming batch files. I later got into linux and read about it's background and history. "You mean UNIX has been around for 30 years and I had no idea that my beloved DOS was a disgrace?"