I think the issue of anonimity is always twisted in these cases. Its as though the man is being treated unjustly, that he is somehow being singled out for punishment by being named. But in reality, it's the victim who is being singled out for justice. If the man was alledged to have committed any other crime - mugging, battery, arson etc - then we would not question why he was not given pre-trial anonimity. It would be accepted as part of the justice process that he (and his victim usually) would be named.
So why should alledged rapists be granted anonimity? Why should we treat them differently? Why are they so special? I can't really think of any good reasons to treat them differently than we do alledged muggers or violent thugs? Are they not also harmed by false accusations?
I can however, see good reasons to allow rape victims to have anonimity. It encourages them to come forward, free in the knowledge that the world and his wife will NOT know the seedy details of the worst event in there lives. It allows them to put the past behind them and not be judged by all us heartless fuckers