Just a couple of things I've seen lately.
There was a somewhat recent habeas grant out of the Western District of Pennsylvania based on prosecutorial misconduct. According to this article, "the prosecutors relied almost entirely on the testimony of a single witness who claimed to have witnessed Munchinski rape and shoot the two victims. However, the federal court judge said in her ruling that the alleged witness's story changed so often 'that one wonders whether he witnessed the murders at all.'"
The MJ who decided the petition also granted petitioner's request to be released from custody pending a new trial. Petitioner had been in prison for 25 years. The name of the case is Munchinski v. Wilson.
A really interesting habeas case out of Michigan referred to as the "Mother's Day Murder." According to this article and video, a 7 Action News reporter in Detroit found a new eyewitness for the defense. On Mother's Day 1999, a woman was shot while parked in a minivan with her three children aboard. She later died. Turns out the police never interviewed (at least) one of the children in the car. This reporter found this child (who is obviously much older now) and he says that he could identify the shooter and his description of the shooter does not seem to match the description of either person who was convicted of the crime. Most troubling to me was that it appears that the main evidence against the two people convicted of the crime were witnesses who claimed to hear the two defendants talk about the murder. Those people later recanted saying that the police threatened them to implicate the defendants.
The habeas angle: the case is currently at the habeas stage in federal court. The DJ assigned to the case has granted a stay to allow petitioner Justly Johnson to pursue the newly discovered evidence issue in state court.
Finally, on October 31 November 2, the Supreme Court is going to hear argument in the habeas case of Gonzalez v. Thaler. Appeal and Habeas has a preview.