Via ReliefWeb, OCHA has published Haiti: Cholera Snapshot (Published on May 2012) and a Humanitarian Bulletin, May 2012, both PDFs. The first includes some tables and graphs, including one showing a bad spike in cholera deaths late in April.
While I'm grateful for this information, it's still frustrating to get it weeks late. OCHA makes an understandable fuss about the lack of funding from international donors, but more money might be forthcoming if we got news about cholera instead of just history.