I really regret not filling one in for my two kids. I feel like I've forgotten sooo much - especially the little things that make you smile! That said, think it can be a bit of a chore when you're a busy parent with a little, screaming bundle of joy. What does everyone else think?
what you might want to try is jotting stuff down on your calendar. this is what i did (was so much easier than digging out the baby book and the special pen and finding the time and the head space for it...), then when i had a day to myself i would go through the calendar and transfer bits to the baby book. course i'm gonna keep the calendar too, even if it does have all the other usual crap on it. i'll be doign the same again next time really want my little ones to have baby books. i know i enjoyed looking back on mine when i was younger, even if it did mostly just consist of a list of injections and dates of teeth!
I bought a plain-page hardback A4 posh notebook for each of mine and have used it as a scrapbook - anything from scan photos to birthday invitations from classmates. It's a nice place to stick stuff, I'm glad I did it!