Here are the classes, structs, unions and interfaces with brief descriptions:

Error
Object
Gnome::Conf::ChangeSet	A ChangeSet is a set of changes to the GConf database that can be commited and reversed easily
Gnome::Conf::Client	The main Gnome::Conf object
Gnome::Conf::Entry	An Entry stores an entry from a GConf "directory", including a key-value pair, the name of the Schema applicable to this entry, whether the value is a default value, and whether GConf can write a new value at this key
Gnome::Conf::Error	Exception class for Gnome::Conf::Client errors
Gnome::Conf::Schema
Gnome::Conf::SetInterface	Common Interface for key-value settable objects
Gnome::Conf::Value	Wrapper for primitive types