I know this is a big Mac day, but...(kitchen flooring question)

[Dubya]

If your laying tile, you'll want to install "crete board". It acts as a subfloor and stiffener. If there's vinyl already there, it probably already has a quarter inch sub floor which is okay for new vinyl, but will have to be removed for tile and crete board. Otherwise too high for surrounding floors.

Also consider laminate. Very easy to install.