I just installed Pergo in the family room and told my kids no drinks allowed....no questions asked. I told them this floor was no good near water because of it's composition.Then to prove my point I took a scrap of the Pergo and threw it in a jug of water overnight.... and nothing happened

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That said, I would only install laminate in a wet area if the manufacturer's warranty said it was OK for a bathroom... Mine had the underpad attached... not sure if that changed the water resistance Underlay could be an issue.
There is also a lot greater chance of water damage and residual water in a bathroom and I have read several threads here about water damage in foyers and sun rooms. Bamboo might be an alternative.:thumbsup: