What would be the effects of replacing the Moon with an Earth-like planet?

Let's assume that for whatever strange -- probably magical -- reason, the Moon was suddenly and instantaneously replaced by a planet identical to Earth in terms of mass and size. Its orbital path is identical to that of the former Moon. Aside from deciding how the planet got there in the first place, and where the former Moon went, what would the effects of its appearance and presence be on us Earthlings? For some extra fun, let's also assume this other Earth-like world has its own biosphere, and surface conditions similar to Earth (atmospheric composition and pressure, surface water, soil composition, etc).

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What would be the effects of replacing the Moon with an Earth-like planet?

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