I'm still finding out things that were changed with Apache 2.
I noticed that my webalizer information wasn't being updated and then I found out that the logs file have changed... In fact, I've noticed that before, 'cause I have some aliases to access_log and error_log to help me debugging web stuff, but I had completely forgotten about that later.
If there was some way to have applications to setup some environment variable and have programs reading it... It would make commands such as "set" completely useless due to the huge amount of variables, but would definitely make migration from one thing to another easier.