I was lurking on the 0-3 months board (I like to see what questions all the new mommies have) and I saw a link for this website. They are stickers that you stick on your baby's onesie that say how old they are, so you can take pics each month. Check it out---so cute and so reasonable! I'm ordering them as soon as we know what we're having!
Re: XP: milestone stickers
Have you seen DailyBooth?
It works best if you have a web cam. Its neat to go back and look at the photos. To witness the change, etc.
Does that site work with macs? We have two, so I can see us using photo booth a lot when he is here! I'm going to print it up into a huge hardback book using an online publisher for a keepsake after a year.