Some of Slate's French collaborators dissected this notion is a piece called "Dominique Strauss-Kahn Conspiracy Theorists Are Embarrassing Themselves," which I recommend you read. The authors make the following important point:
The potential crime, as they see it, is all about DSK's weakness rather than his strength and the maid's weakness. Yes, we must respect that DSK is innocent until proven guilty. But to consider the case simply as a conspiracy theory or an "ambush" on a "libertine" is to transform the presumption of innocence into a presumption of guilt on the part of the accusers.
A similar point is made by the French feminist activist Magali de Haas in an interview in the weekly L'Express. The article is in French, but de Haas says that all the attention is being focused on DSK and his tragic downfall, rather than on the victim of the alleged crime. De Haas points out that many French people see this at most as a case of a lady's man going a little too far, instead of the serious crime he is accused of, and tend to think of sexual violence as some sort of joke. De Haas reminds readers that an estimated 75,000 women are victims of sexual assault each each in France, and concludes that DSK is not being accused "of an affair of morals, but a crime."
There does indeed appear to be a victim in this case, a young African immigrant who has all but been identified by name in the news media. Whether she is an agent of Sarkozy or of the Socialists remains to be seen; but I wouldn't bet on it.