In additon to Steve Kenson, I would add the following individuals (and the list is not necessarily finalized).
Sean Reynolds. I love the variant rules on his website. I especially like the variant rules for both poison and "Fewer Absolutes" (he just needs to finish the latter).
Charles "Vigilance" Rice: Legend of the Samurai, Legends of Excalibur, and of course "Blood and Fists"
Andy Collins: Based upon Dragonomicon, Unearthed Arcana (especially the class variants and alternate combat rules), and the stuff on his web site, I'll forgive the Epic Handbook which should be burned, buried and forgotten (my opinion of course)
Monte cook: Despite his preference for higher magic and the go go mentality, I wonder what he might do differently with DND given that he has had time to reflect on 3e.
Sean Reynolds. I love the variant rules on his website. I especially like the variant rules for both poison and "Fewer Absolutes" (he just needs to finish the latter).
Charles "Vigilance" Rice: Legend of the Samurai, Legends of Excalibur, and of course "Blood and Fists"
Andy Collins: Based upon Dragonomicon, Unearthed Arcana (especially the class variants and alternate combat rules), and the stuff on his web site, I'll forgive the Epic Handbook which should be burned, buried and forgotten (my opinion of course)
Monte cook: Despite his preference for higher magic and the go go mentality, I wonder what he might do differently with DND given that he has had time to reflect on 3e.