Monday's attack came amid discussion of doubling the US forces in Afghanistan by mid-2009.
Control of roads and rural areas vexes coalition effort.
Readers write about the need for ethics training in the US, bargaining with Afghanistan's tribal leaders, and why OPEC should be dissolved.
Negotiating with the Taliban might be the only hope for peace, but women are nervous.
Southern Sudan, Uganda, and Congo launched operation Lightning Thunder this week to flush the Lord's Resistance Army out of its base in northern Congo.
The note announcing the explosives lacked references to Islam, jihad, or the Taliban.
In Afghanistan, US and NATO reassess their strategy amid concerns that their efforts are failing.
The three Pakistanis and one Saudi named belong to Lashkar-e-Taiba.