It is still available. You can download it here: http://www.videohelp.com/tools/DVD_Shrink
DVDShrink can only decrypt movies with simple CSS encryption. It is completely ineffective as a decryption program with most modern movies that have structural protection. That said, it is still a good transcoder and will reduce the size of dvd video very well once the protection is removed.
If you need a decryption program, I'd suggest DVDFab HD Decrypter, which is the free section within DVDFab. It will continue to decrypt and rip movies to the hard drive for you even after the trial for the main section of the program expires. The only caveat is that it will lag behind the commercial version by 4 to 8 weeks in decryption capabilities.