TrueCrypt is an awesome tool for creating secure partitions and encrypting your files. Mounting and dismounting partitions, however, can be a hassle. MTCrypt speeds up the process with a simple GUI interface.
MTCrypt doesn’t do any encryption or decryption of its own, it’s merely a front end tool for TrueCrypt. Rather than work your way through the menus in TrueCrypt–for casual use by an inexperienced user the TrueCrypt GUI is a bit overwhelming–MTCrypt assists you with a simple interface for the mounting and dismounting of TrueCrypt volumes.