We aren't going to take too much time up on this, but many SEO experts feel that Italicizing your text also causes the Search engines to pay more attention to those words.

These experts also suggest that you should use Italicizing at least once on every page for your keywords

The code looks like this:

<em>Italicizing</em>

It's easy to do, and of course since you are doing SEO for people instead of machines, only do it when it fits into your overall plan.

Bolding Text falls under the same rules, but should probably be used a little more often.