Mira Cook + Mark David Ashworth + Martin Crane

With his loyal Imposters in check in tow? ("in check" means he was keeping them from going wild), Costello's recent album National Ransom was a pretty rippin' throwback to Brit rock. More importantly, he's been spotted all over town lately, sitting in with everyone from the Strokes to Furthur. No revival trudge for Costello, then…