Sorry that I'm so late coming into this discussion.

I too love the theory that the Ripper was really Prince Albert Victor, the Duke of Clarence, eldest son of the future King Edward VII, brother of King George V.Its a very attractive theory. Albert Victor, known as Eddy to his family,was a dull, slow witted young man.He was DEFINITELY implicated in the second most notorious sex scandal of his time ( the first beng the affair between Oscar Wilde and Lord Alfred Douglas ), the Cleveland Street Scandal, concerning a homosexual brothel in the above named thoroughfare. However , his whereabouts at the time of the murders are well accounted for. To be honest, the Prince does not really fit the profile of the Ripper anyway. here was a man with strength and energy, of which the Prince lacked both , a cetain amount of anatomical knowledge, again which the Prince lacked, and probably a pathological hatred of women. Eddy was bisexual, but its worth noting that the last word he ever spoke was "Helene " - the princess of the deposed House of Orleans with whom he had fallen in love, prior to his engagement to Mary of Teck, who subsequently married his younger brother. Eddy died on the 14th january, 1892, not of syphilis as some have conjectured, but influenza.

One sus pect who has not yet been mentioned in this discussion, is one Francis Tumbelty. Forgive me if the details I give in this post are rather sketchy -I hadn't heard of him before I watched a programme on Discovery the other night, so please bear with me on this one.
Tumblety was a quack doctor from Rochester, New York, who was definitely living in the East End of London at the time of the Whitechapel Murders. According to the programme, Tumblety already had a history of sexual misconduct, and violence towards women before leaving America.Apparently, some weeks before the mnurders, Tumblety made an approach to the Royal College of Anatomy in an attempt to buy twenty uteruses ( uteri) which alerted the police, from which time onwards a file was kept on Tumblety. One of the women who may have seen the ripper approach one of the victims was postive that the murderer did have a foreign accent. Dureing his stay in England, Tumblety was actually arrested by the Metropolitan Police for gross indecency. He was known to keep a large stock of obscene literature, and had a reputation for 'slumming', that is visiting areas such as Whitechapel to conduct business with known prostitutes.
Almost immediately after the last of the murders, Tumblety booked passage on a ship to return to America. Much was made of this in newspapers on both sides of the Atlantic, with the story being that officers from Scotland Yard would be pursuing Tumblety with a view to bringing him back to England to interrogate him. This never happened.
Amongst other hearsay evidence against Tumblety, visitors to him in later years were said to have been perplexed by the cabinet he kept containing speimen jars with female reproductive organs in them, almost like a trophy cabinet. One visitor is even supposed to have commented on the fact that Tumblety is even supposed to have especially cherished two rings- similar, if not identical to the two rings which were removed from the body of Annie Chapman.