I've got the shorebird guide -- it's very narrowly tailored to shorebirds. (That means Sandpipers, Plovers, Stilts, and Avocets, not just anything you see on the shoreline.) It's good, although I'd want something else as well, I think. In general, the two that I would recommend as general bird guides are Sibley Birds, and the National Geographic Guide. Peterson's are good, but I'm not sure what the more recent editions look like.