The Pragmatic Programmer aged better than I expected

The tools it mentions have changed, and the newer edition helps with that. But the actual advice, like don't repeat yourself and learn your editor and take responsibility for your work, is exactly what I wish somebody had told me in my first job.

It's also easy to dip into, with short sections you can read between tasks. I've given my copy to two junior developers so far, and one of them gave it back with notes in the margin, which I liked very much.