Don't you love the one-uppers? Get used to it - next it'll be walking, talking, preschool, solving pi, coming up with a cure of cancer, etc. Ignore them!
Oh, and I LOVED the one mom's response about be thankful he isn't everywhere and into everything just yet. That's soooooo true! Once the baby can crawl or walk, be prepared for your living room to be a disaster zone of toys and items *laugh*.
My son rarely crawled. He pulled up on the furniture around 9 months, began cruising after than, and then was walking at 10 1/2 months. As you can see, crawling certainly did not hamper his ability to walk!
If he is appearing to want to walk, try standing him up near the couch or a coffee table (no sharp edges though - we learned that the hard way). At 9 months, he may be able to hang on and will probably be thrilled that he can stand up and see the world from a whole new perspective - it's really empowering! Put a board book on the cushion in front of him to keep him entertained. If he indicates interest in cruising, place fun toys on the couch cushion off to the sides and see if he tries to cruise to get them. Above all, follow his lead and see what he is comfortable doing - no need to rush it! If he doesn't stand up or cruise, no biggie. Just let him back on the floor to play as he wishes.
One of my favorite books is "The Wonder Years" by Dr. Tanya Altman Reimer. It is published by the AAP and is a good guide to developmental issues. I like it because it gives an idea of when children will start doing (insert skill here) and gives tips for games/play/ideas on how to help the child develop skills.