Blogger Ali Abdulemam was arrested over a month ago and has been held in solitary detention ever since. His trial is today, but the charges against him are unknown. There is an active campaign in his favor, which produced the above video. Abdulemam's arrest is part of a wider crackdown on civil society that has taken place in recent weeks, with many arrested and held illegally and fears that they may be subjected to torture.
Update: Here's an AP report from the trial.