Global Witness did a great report on mining in the DRC which talks about child labor and other labor rights

abuses.  The makeITfair campaign in Europe has also been campaigning to get electronics companies to take responsibility for their mineral supply chains.  You can check out responses from major electronics companies to that campaign here.

Here are some other excellent articles and resources about abuses in DRC's mining sector and the connection to U.S. consumers:

"China Let Child Workers Die Digging in Congo Mines for Copper": Bloomberg News
"A Glittering Demon: Mining, Poverty and Politics in the DRC": CorpWatch
"DR Congo's Child Miner Shame": BBC
"Inside Africa's Playstation War": Toward Freedom
"Plight of African child slaves forced into mines -- for our mobile phones": Sunday Mail

Below is a video from the Pulitzer Center for Crisis Reporting called "Congo's Bloody Coltan":