I use iherp, when I remember to update it, speaking of which I should do that... I love it but I am actually not on my computer much, at least not with internet...

I use pen and paper for quick notes, then hope I can find it again when I need to record it.

And I recently started trying the Pet Pal app for iPhone, its nice because I always have my phone on me and it is easy to keep it up to date and check data at random times. It would be nice if I could look at a single page that has feedings and weights on it but it is not bad if your always running around like I am.