I would like to suggest a few things:

First: a playlist generator like itunes' shuffle mode. Click it and you get a 20 track set created in a crate at random. This is good if you want to practice or want a challenge.

Second is some kind of notepad or place to write down notes like - "make this announcement", or maybe the name of the club you're at or the performers. It would be nice to just have a drop down near "Prepare" and "Browse" that lets me write reminders to myself.