Lucky me, I learned to crochet as a kid (knit, embroider, quilt, and sew too!) but didn't pick it up again until I was about 18. I bought the Crocheting in Plain English book and have used it as reference. It was GREAT. The projects are a little hokey and dated, but the techniques and presentation are top-notch.
Same here, I learned to crochet when I was 4. The projects in that book aren't hokey--they're AWFUL. And really hard, too. But I haven't found a better one yet for learning stitches, etc.