Actually.....

Some of the previous responds are incorrect.

The Moon moving away from us will not fundamentally affect our orbit.

The Earth's Orbital path is elliptical around the Sun while the Moon also travels elliptically around us.

As it moves away the effect will be to reduce the difference between High and Low tides across the planet.

When it was originally a lot closer 10-20 times closer; Tidal changes where far more dramatic; potentially in the region of 10s..100s of feet. So the likes of London, California etc would have been completely submerged every 24 hours :-)

This is because the Moon pulls on the Water as a Mass and effectively drags it across the surface. The other effect is that over the Millenia the Moon has acted as a 'Brake' on the Earth's Spin.

When it was much closer in it's earlier formation the Earth Day was actually around 20 hours. Over time the Moon's braking effect has resulted in us enjoying a 24hr day now.

There will still be high and low tides when the Moon departs in a few Million years..... because as the Earth spins the Sun will also 'pull' on the Mass of the Sea.

The biggest High and low tides result when the Moon is directly between the Earth and the Sun because the Moon and Sun are both then pulling on the same Mass of Water on the Earth's surface.