I also blog because I enjoy writing about our day-to-day lives. I enjoy writing about how my children are learning and growing and blossoming into the unique little people that God created them to be. I have never been able to keep a written journal for more than 3 days, so I am proud of myself for keeping this up for so long.
The main reason that I blog is that I want my kids to be able to look back and read about their milestones, see pictures of themselves growing up with their siblings, know what their mom was thinking and feeling, read letters that I have written specifically about and to them. In this age of digital photography, I worry that many of our photos will either be lost or that there will be so many photos that we could never sift back through them, so it is important to me to save them somehow.
(My books have come from www.blog2print.com - they do all the formatting for me. It makes these books relatively effortless to create.)