Agreed. Though here are a couple to get you started:
+k password = set a password key for the channel so only those who know it can enter.
+m = moderate the channel so only those who are a voice or higher can speak.
+b nick/host = ban someone.
+n = no external messages so people have to be in the channel to message the channel.
+t = only ops can change the topic.
+r (or maybe it's +R) = only people who have registered nicks can enter the channel.
Those are usually the same from network to network, but there may be some out there that are different. As mentioned, the #help channel is a great place to start.
