A few links I've found useful:
Bloomberg has a good piece on the election's economic implications.
David Lewis and Jonny Hogg at Reuters are updating their reports regularly.
Al Jazeera has some nice pictures.
Laura Seay voices her worries on the Holocaust Museum's website. Money quote: "Some Congo-watchers believe violence will be short-term, sporadic, and limited to urban zones, while others fear violence could spread rapidly."
Ben Shepherd at Chatham House says this election might be just the first of several dangerous moments ahead.
Mvemba Dizolele in Foreign Affairs says the West's failure to seriously engage with the Congo during this electoral cycle leaves the Congo ripe for post-electoral violence.
Most of Congo's popular musicians are in Kabila's pocket. Here's one who's not.
The U.S. State Department, through its spokesperson, said today that it denounced the violence and was concerned about "anomalies" in the Congo election.
The BBC has the most thorough coverage among the Western press, with reporters deployed in Kinshasa, Lubumbashi, Kisangani, and Bukavu.
Radio Okapi is doing an excellent job, but the prize for the best Congolese coverage of the election belongs to the AETA, a site I regret I just came across today.