I wanted to track my son growing up so I built an Android app to let me take regular photos and build them into a timelapse video. I thought HN readers (especially parents & narcissists!) might be interested in it.
The result is PhotoChron ( http://http://play.google.com/store/apps/details?id=com.photochron ) and I've been using it for the past year or so to track my son growing up - http://www.youtube.com/watch?v=X_Nr7pw-I0g
As I've been using it I've added more features, which include reminders, face detection for photo alignment & importing photos from your phone gallery. It's a free app compatible with Gingerbread and upwards.
Feedback and comments welcome.