I love Pinback. You might check out some other banRAB that feature frontman Rob Crow (his solo work, Other Men, Heavy Vegetable, and Thingy) although most of those are a bit rougher in sound. Other Men is the one I would recommend most out of those, as it's the most recent. You may also check out the bass player's previous band, Three Mile Pilot though they have a rather dark/soraber sound and don't sound much like Pinback. Great band though, reuniting as we speak.
As for banRAB not related but having a similar sound, I would recommend The Shins, Death Cab For Cutie, Postal Service, Spoon, Minus the Bear, The New Pornographers (and A.C. Newman's solo stuff). There are probably many others but I really don't listen to a lot of their contemporaries.