OK, OK, I couldn't narrow it down to just 1 great knitter whom I admire. I will focus on 2: Stephanie Pearl-McPhee (AKA the Yarn Harlot) and Jared Flood (of Brooklyn Tweed).
The Yarn Harlot is one of the best bloggers I follow. She is humorous, light-hearted, and above all, dedicated to her craft. She is the most prolific knitter I know about, and her love for other knitters is obvious in her enthusiasm for her readers as well as those she interacts with at her various speaking/knitting engagements. And, I love the way she doesn't *just* write about knitting. She puts a fair bit in there about her family and friends, which helps the reader get to "know" her on a little more personal letter. I strive to do something similar with my blog, but I don't pull it off nearly as well.
Another knitting blogger I greatly admire is Jared Flood. Mostly I love his photographs. They capture the beauty of knitted objects so perfectly, and the projects seem to just grab me and say "knit me!". His designs are just gorgeous. Here is some eye candy from his blog for you to enjoy: