Hmmm, there isn't any one thing that stands out. Metanium for stubborn diaper rash is good but for me (and Sammy) in particular, it has to be summer rompers. He's a very slim baby and crawls out of his trousers. He also will crawl to the top of a sleep suit if it has feet or long legs. Rompers stay on but keep him cool. They are also much more accomodating of his big cloth diaper butt! Especially the ones from Hanna Andersson.
We've also had a bottle of Dr Bronners castile soap which we use as bath soap and shampoo. He's a year old and there's still loads left.