Amano

Ok, let me summarize my situation in bullet points to make it easier to read:

-Last year (Fall 2004), I apply for grad schools and research fellowships. I get into grad school, but no luck on fellowships.
-In August 2005, before I leave for grad school, I ask in person the same 3 professors to write recommendations again this year for fellowships. I get "yeah sure no problem" from all 3.
-The deadline for recommendations is Dec 31 (online submission). 2 of the 3 have submitted, one hasn't.
-The one that hasn't submitted, I've sent multiple reminder emails which he himself requested me to do at the beginning.
-I have had 0 responses from this one professor. Grad school is far away from undergrad, so all my communication has been through email. But I'm visiting family near my undergrad school for winter break, so I could go visit this professor personally if I want to.

I know he does a lot of his recommendation writing between Xmas and New Year's, so I'm guessing he's probably working on everyone's recommendation right now. But the fact that I've gotten absolutely no response from him concerns me.

Would a personal visit or a phone call / voice mail message be too aggressive?

Any other suggestions on what I should do?

Thanks in advance for your help