I carry a Lett's daily diary in addition to a sketchbook. I use it to plan my year, schedule meetings, and note significant events. I also use it as a sketchbook, design notebook and photo album. My journal and my sketchbook tend to influence each other: I write in my sketchbook and draw in my journal. By the end of the year, the book is thick with photos and watercolor- crinkled pages. And it seems to weigh more than a new, unused book, but that could be my imagination.
By the way, I know its Christmas morning, and yes, I do have a life. I woke up early to do this post, and soon will be cooking breakfast for my three boys (and my middle son's girlfriend), opening presents by the fire and celebrating the day with Suzanne.