By Edward Jay Epstein, New York Review of Books, Dec. 22, 2011 issue

[....]  Several mysteries remain. Was there anyone in room 2820 besides Diallo during and after the encounter with DSK? If so, who were they and what were they doing there; and why, in any case, did Diallo deny that she’d gone to the room? Because she denied it, the police, according to the prosecutor’s recommendation for dismissal, did not search 2820 or declare it a crime scene. And where, if it still exists, is the BlackBerry that DSK lost and feared was hacked?

All we know for sure is that someone, or possibly an accident, abruptly disabled it from signaling its location at 12:51 PM. DSK himself has not explained why he was so concerned about the possible interception of his messages on this BlackBerry and its disappearance. According to stories in Libération and other French journals on November 11, 2011, DSK sent text messages on a borrowed cell phone to at least one person named in the still-unfolding affair involving the Carlton Hotel in Lille, a scandal in which corporations allegedly provided high-class escort women to government officials. (DSK denies that he was connected to the prostitution ring.)  [....]

Also see:
Dominique Strauss-Kahn linked to French prostitution scandal
Former IMF chief implicated in investigation into alleged pimping at luxury hotels in northern France
By Angelique Chrisafas in Paris, Guardian.co.uk, Nov. 11, 2011

[...] The affair took a new turn after Strauss-Kahn's name came up in statements made to investigators, according to a series of leaked transcripts published in the French media in recent weeks.

Businessmen were alleged to have paid women to travel to Paris and the US to take part in "soirées" with Strauss-Kahn at his own request, including when he was head of the IMF and tipped to become the next French president. Le Monde reported that one senior French police officer had travelled twice to Washington DC last year with businessmen, including the head of a Lille-based construction firm, to accompany a group of women who worked in massage parlours in Belgium to see Strauss-Kahn. The former head of the IMF was said to have received three visits from the group in Washington. The last visit ended on 13 May, the day before he was arrested over the attempted rape of a hotel maid in New York. [....]

And:
Strauss-Kahn wants hearing in French prostitution scandal
JTA, Nov. 16, 2011

NEW YORK (JTA) – [....]  "From the moment his name appeared in the so-called 'Carlton Affair' on Oct. 9, Dominique Strauss-Kahn said he wanted to be heard as fast as possible by the magistrates leading the judicial inquiries,” said his lawyer, Frederique Baulieu. “A month has passed without him being heard, and the media lynching has snowballed during that time.”  [....]