Maybe one day this will be more detailed, but the help functions work just as well.

NickServ allows you to "register" a nickname and prevent others from using it. For more information and help type:

/msg nickserv help
ChanServ allows you to register and control various aspects of channels. ChanServ can often prevent malicious users from "taking over" channels by limiting who is allowed channel operator privileges. Any channel which is not used for two weeks, will automatically be cancelled. For more information and help type:

/msg chanserv help
MemoServ is a utility allowing IRC users to send short messages to other IRC users, whether they are online at the time or not, or to channels for anyone with auto-op access or higher. Both sender and recipient must have their nicknames registered with NickServ in order to send a memo, or if the recipient is a channel, it must be registered with ChanServ. For more information and help type:

/msg memoserv help
HelpServ is a utility to get help on commands from other service nicks. For more information and help type:

/msg helpserv help
This allows users to turn on and off special host masks. It also allows users to request custom hostnames.

/msg hostserv help
The BotServe service allows you to put a special version of ChanServ in your channel and name it however you like. This, however, is not allowed by most users.

/msg botserv help
OperServ allows Operators/Administrators with access, to maintain control on the network.
Global is a utility allowing IRC users to receive global messages from network administrators.