There's a extensive article on The New Yorker about the Madrid bombings.
Find the printer-friendly version here:

Here's an excerpt:

"At 7:37 A.M., as a train was about to enter Madrid’s Atocha station, three bombs blasted open the steel cars, sending body parts through the windows of nearby apartments. The station is in Madrid’s center, a few blocks from the Prado Museum. Within seconds, four bombs exploded on another train, five hundred and fifty yards from the station. The bombs killed nearly a hundred people. Had the explosions occurred when the trains were inside the station, the fatalities might have tallied in the thousands; a quarter of a million people pass through Atocha every workday. The trains at that hour were filled with students and young office workers who live in public housing and in modest apartment complexes east of the city. Many were immigrants, who had been drawn by the Spanish economic boom."

On related news:

"El equipo de 'Al filo de lo imposible' (a Spanish TV program specialized in shooting almost impossible feats) ha logrado, junto a un equipo italiano que quería rememorar el 50 aniversario de la primera ascensión, romper la maldición del K2, que en los tres últimos años no había permitido a nadie que pisara su cumbre. Oiarzabal y Edurne han colocado en la cima un banderín con los nombres de las 192 víctimas mortales de los atentados del 11-M, porque en palabras de Sebastián Álvaro, director del programa, "era el mejor homenaje que nosotros les podíamos rendir."