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

CArduinoInStream	Input stream for Arduino Stream objects
CArduinoOutStream	Output stream for Arduino Print objects
Ccache_t	Cache for an SD data block
CFatPos_t	Internal type for istream do not use in user apps
CFile	Arduino SD.h style File API
Cfstream	SD file input/output stream
Cibufstream	Parse a char string
Cifstream	SD file input stream
Cios	Error and state information for all streams
Cios_base	Base class for all streams
Ciostream	Input/Output stream
Cistream	Input Stream
CMinimumSerial	Mini serial class for the SdFat library
Cobufstream	Format a char string
Cofstream	SD card output stream
Costream	Output Stream
Cpgm	Type for string in flash
CSd2Card	Raw access to SD and SDHC flash memory cards
CSdBaseFile	Base class for SdFile with Print and C++ streams
CSdFat	Integration class for the SdFat library
CSdFile	SdBaseFile with Arduino Stream
CSdSpi	SPI class for access to SD and SDHC flash memory cards
CSdStreamBase	Base class for SD streams
CSdVolume	Access FAT16 and FAT32 volumes on SD and SDHC cards
Csetfill	Type for setfill manipulator
Csetprecision	Type for setprecision manipulator
Csetw	Type for setw manipulator
CStdioStream	StdioStream implements a minimal stdio stream