A little cheesy, but...

I checked out the first episode of Deadly Manners, a new 10-episode podcast that features a big-name cast (including LEVAR BURTON!!!) doing a radio-drama take on a vintage-style mystery. The concept is great, although I'm not 100% sold on their execution—there's too much variation in the quality of the voice acting, and the mystery itself seems pretty silly. Still, it's a fun idea, and classic mystery buffs should probably give it a shot.