Transmute is a freeware bookmark conversion utility.

This amazing utility will help you to try out different web browsers, synchronize bookmarks between systems, organize bookmarks, convert bookmarks for use in bookmark managers, share bookmarks with others and more. And best of all, it's free!
Transmute is the first and only bookmark converter to export bookmarks between all of the major formats:

Google Chrome
Transmute supports the new Chrome browser, including dev channel releases.

Mozilla Firefox
Firefox 1 & 2 are supported as well as Firefox 3, with its new database model.

Microsoft Internet Explorer
Internet Explorer favorites can be imported and exported with ease.

Opera
Opera browser hotlists are also well supported for easy importing and exporting.

Apple Safari
Safari is the web browser from the people behind the iPod, iPhone and iTunes.

Chromium
Chromium is the open-source project behind Google Chrome.

more info: http://www.gettransmute.com/