Arar v. Ashcroft, et al., US Court of Appeals for the Second Circuit, November 2, 2009 [holding that Canadian citizen Maher Arar cannot sue the US government for damages based on his detention in the US and his detention, interrogation, and torture in Syria after he was mistakenly identified as a terrorist].
Reported in JURIST's Paper Chase here. Latest commentary available here. JURIST has more on Maher Arar.