My former colleague Marshall Kirkpatrick put up a post last April about the wrong ways to pitch ReadWriteWeb: http://www.readwriteweb.com/archives/pitching_rww.php -- #2 is via phone (though Marshall didn't mind it as much, Sarah, Richard, and I all preferred pitches by email).
In July I wrote a post the original poster (or anyone else) might find helpful about how to pitch a blogger: http://www.sitepoint.com/blogs/2008/07/12/how-to-pitch-a-blo...
I was mostly writing about how to pitch me, but I think the advice might be helpful when figuring out the best way to pitch any blogger.
The short version: 1. Don’t Cold Call — Email First 2. Engage Us In Our Natural Habitat 3. Personalize Your Communications 4. Offer An Exclusive 5. Pitch An Angle 6. Be Flexible 7. Give Adequate Lead Time