I'm using Knoppix for a class on LAN Security this term (RH doesn't work well on the new hardware and I'm kind of pissed at them anway) and my students and I are discovering all the little nice touches that went into this distribution.

Example:
Setting up Kerberos on RH 8 was an 18 page lab handout along with plenty of hand-tweaking to make sure the clients and KDC could talk.

With our new setup, it's about five minutes to get everybody set up.