Another major one is that they are great time-savers for searching new projects about crochet...
HOW DO YOU COLOR YOUR WORLD?
It is fun to visit blogs that have linked to mine, and see projects knitters are doing and what changes they have made to make the project their own. Yarns used or changes made in edgings, shaping, or other details. Sometimes, I will google a design to see what people are doing.
I have come across some very interesting blogs that way.