I'm no expert but I think it is best to optimize every page that the spider will see, which is basically every page on your site.
Another critical component of SEO is backlinks (i.e. links from other sites to your site). It doesn't matter how much you optimize if nobody is linking to you. The major SE's use the number of backlinks and the PR (page ranking) of those sites to calculate your ranking. Basically the more people that link to you, the better your ranking will be.
Of course there is WAAAY more to SEO than that. It's all voodoo to me.
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