My “first impressions” hands-on review of the Canon 1D Mark IV is almost ready. It will be up within the next day. If you are considering getting one, this may be a useful review for you.
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The "Go-To" Instructional Photography Blog, by Michael Willems
It’s up now: http://mvwphoto.wordpress.com/2010/02/08/1d-mk-iv-hands-on-impressions/