The Sudan referendum has been observed by a number of watchdogs- what did they think of the conduct?
The EU mission has made a statement. You can also find facts about its deployment on the website
The Carter Center has a number of press releases on conditions. Their website also has more detailed reports on health and democracy programmes which it has organised in the region over a number of years.
NDI has reports on observations by SuNDE, a coalition of local groups working to educate and register Sudanese voters. These are located on the right hand side of the page.
Finally the Sudan Vote monitor website has contributions from citzens mapping incidents of abuse.