Askgrim is an incredible high wire improv act from Tom Konkle. He is the guy playing Grim and one of the best actors period. I've seen him in lots of stuff always good. Yes longer episodes I second Lou.
Ask Grim is an awesome show. Grim is a witty, cuddly, jolly good fellow if you like your humor of the gallows variety. More More.. also the episodes should be longer!