How to change file associations on Mac OS X?

How to change file associations on Mac OS X? By default PNG images open in Preview. At some point, this has changed on my system so that clicking on a PNG file launches Paintbrush. While that's a really nice app, I'd still like the default to be Preview. How to change it back? (I formulated the question title to be little more generic — how to do this for any file types?)
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bert [Entry]

"Get Info on the file in Finder (⌘I)
Find the ""Open with:"" section
Change the application to the one you want
Click ""Change All…"" to apply the change for all files of the same type."