What keywords does my site rank for?

Hi guys,
Does anyone know if there is a tool that allows me to see all the keyword phrases my site is ranked for because at the moment I look at my analytical/stats and realize my visitors are vising my site through Google using keyword phrases I didn't even know It ranked for.

This isn't a problem as such but it would be great to know what keyword phrases it ranks for without having to search google for random phrases trying to see my site. Does anybody else have this problem?

Cheers

In google analytics you can see traffic sources, including keywords from search engines.

if it's a wordpress blog, you can install rank tracker, I have it on all my sites, and it emails you with the phrases your site is ranking for

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Google webmaster tool is the answer...