Yeah, with a standard lens, you have to correct the perspective in photoshop. You'd need a tilt-shift lens (or a large format camera) to correct it in-camera. There's plenty of photoshop tutorials out there on perspective correction, if you want to look into it.
Thanks for the info. I shot straight on, so the crookedness has less to do with perspective than the fact that the building is a tad cockeyed. If I ever plan on printing this I'll go ahead and straighten it, but until then it isn't too big of a deal
Very nice! When you scroll from the bottom up you can see that the shingles slowly get more crooked. Not much you can do about that! If you straightened it to align with the top then the bottom would be crooked.