To the extent that the ongoing genocide receives much attention in the press (which is generally not to any great extent), attention is often paid to how China's economic relationship with the Sudanese government limits the ability of the U.N. to engage in strong sanctioning activities against Sudan. China's position vis-a-vis Sudan is a crucial consideration that should not be understated.
Another factor less commonly reported is the U.S. government's conflicted relationship with Sudan, with the Bush administration one of the few around the world that has publicly decried the situation in Darfur and called it genocide (one of the only things I'll give the Bush adminstration credit for), but at the same time the administration sees the government in Khartoum as a critical ally in the War on Terror, largely for having expelled Osama bin Laden and cracked down on Islamic militants after the cruise missile attacks during the Clinton administration.
The Middle East Times has just posted a good overview of the situation: http://www.metimes.com/storyview.php?StoryID=20070616-055135-9519r
Here's one interesting section from the article:
"Marc Lavergne named intelligence chief Salah Abdallah Gosh and Nafi Ali Nafi, one of President Omar Al Beshir's key advisers, as Khartoum's leading strategists on Darfur and who are also well-known in certain Washington circles.
'These people regularly visit Washington and they are in permanent contact with the US, which considers them their special partners,'said Lavergne.
Thomas-Jensen also underscored the fact that Ghosh was flown into the US by private CIA jet for a week-long series of meetings in 2005 with US officials, causing much controversy within the Bush administration.
'By agreeing to divulge everything it has about Bin Laden, Al Qaeda, the Palestinians, Algerian Islamists, and a bunch of other troublemakers in the world, the Sudanese government is providing an enormous service to the US government and is irreplaceable,' said Lavergne.
To placate its critics, Sudan has suggested that Darfur rebels are of the same ilk as Al Qaeda and is seeking to maximize the benefits from its decision to expel Bin Laden and align itself with Washington."