Pampers Extra Protection Diapers Super
My 15 month old is a super soaker at night. We bought these out of necessity and they've been great. I was just about to set a subscribe and save delivery (we're on our second box from Target and I figured it'd be cheaper to subscribe) and I noticed the terrible reviews. We've never had the bursting crystal issue. These are the only thing that will keep him dry at night. I'm a little weary to subscribe now, even knowing they work great for us, because of the bursting crystal issue other people have sited, but I know they have been fine for us.
Update 9/17/11: My son eventually started wetting through these night diapers as well, so we have had to switch to using a very thin poise pad with our regular daytime diapers and he is hardly wet at all in the mornings. This solution was better for us.