Here are some things i've noticed with 1.7 version for linux.
mem usage 0.3-0.4 per process
1 listener = 1 process
Total processes = X listeners + 3
For talk/commentary broadcasts 16kbps/16khz should be great. Just make sure you have the bandwidth to spare
Unfortunately windows' machines *SUCK* so getting any useful data from it is a joke.
the only downside to shoutcast is that there is no support for video .. its probably better that it doesn't Or this would turn into some sort of netmeeting freak show. LOL