Hermetic Stego
Hermetic Stego is a steganography program which allows you to encrypt and hide a message (the contents of any computer file) in another file so that the addition of the message to the container file will not noticeably change the appearance of that file. ... The program can be used with a user-specified stego key or with a default stego key; use of a default stego key allows sending a hidden message to another person who does not know what that stego key is. ... This program allows hiding a file of any size in one or more BMP image files, with or without the use of a user-specified...
http://www.hermetic.ch/hst/hst_setup.zip - 3Mb - Download - Screenshot