SharePoint 2010 List Event Receiver - Available properties

I find the properties model of a SharePoint Event Receiver a bit confusing, and hard to remember. When can I reach the SPListItem's fields, when is After/BeforeProperties available?

The table was borrowed from this post: http://www.synergyonline.com/Blog/Lists/Posts/Post.aspx?ID=122.

List	BeforeProperties	AfterProperties	properties.ListItem
ItemAdding	No value	New value	Null
ItemAdded	No value	New value	New value
ItemUpdating	No value	Changed value	Original value
ItemUpdated	No value	Changed value	Changed value
ItemDeleting	No value	No value	Original value
ItemDeleted	No value	No value	Null

Library	BeforeProperties	AfterProperties	properties.ListItem
ItemAdding	No value	No value	Null
ItemAdded	No value	No value	New value
ItemUpdating	Original value	Changed value	Original value
ItemUpdated	Original value	Changed value	Changed value
ItemDeleting	No value	No value	Original value
ItemDeleted	No value	No value	Null

Happy coding!