[Erik]

There is good evidence that problems can develop over time if diving in cool or cold water. Bone growth occurs in the ear canal.
We use a half of a cotton ball stuck in the ear, to eliminate constant cold water flushing of the ear canal. I just got some Doc's Pro Plugs, which do the same thing, but in a more efficient way. They're supposed to help with equalising too. I have yet to use them as the ice is still on the lakes here, but I may head out this weekend and will report my results.
Cheers,
Erik Y.