At the moment, roughly half of the top sites are down, and half are up. Why that is the case is a mystery to me.

as-Ansar (Arabic): Down - "Under reconstruction"
al-Ekhlaas: Up
al-Faloja: Down - "Suspended"
al-Hanein: Up
al-Ma'ark: Down - "Suspended"
al-Medad: Up
al-Mujahideen: Up
Ana al-Muslm: Up
al-Shmokh: Down - They ask for your prayers as they try and restore the site (which appears to have been deleted from their server).
el-Shouraa: Down - unreachable, no DNS
at-Tahaddi: Up