The first name I recognized in this list was Bruce Schneier and he's #5, but I thought I'd recognize more than 4 or 5 names on the list. Some names that I thought might be missing were, of course, Ben Edelman (a previous guest on the show and focus of several blog posts) and Alex Eckelberry of Sunbelt Software. Perhaps they don't qualify as influencers though, just documentation and protection from spyware and adaware.
Anyway, go read the article and leave people that you think were left out in the comments. Thanks!
The 59 Top Influencers in IT Security
I was looking for the DST2007 blog from MS, but couldn't find it, and am in a rush. Sorry. I hope to find it later, and post it for your edification. :)