For me, the vote is for Ajalkane. Don't know if he win a N9/N950 in the Coding Competition, but he gives the best support, feedback, the most friendly answers and always wants to find a solution to whatever problem or strange suggestion you have with his apps, specially ProfileMatic.
For me he is the truly old spirit of talk.maemo.org

whoever the guy is that leaked the proper flash 10 (not necessary the poster, but the guy who leaked the actual file)...

just wished it was done earlier

If I have to name only one, he is thedead1440.

The single most... no idea, most of my questions/queries/problems are helped by a handful of people though. reinob, freemangordon, AapoRantalainen, Mentalist Traceur, Hurrian, vi_, marmistrz, misiak, misterc, RobbieThe1st, pali, int_ua, qwazix, Sarturn... come to think of it there is much more than handful, each and every one specialising and extremely helpful in their respective part. The above list was just out of the top of my head and is in no way exhaustive, thinking about it come more and more names. The best part about this community is even less tech-savy people like Addison are helpful and share their solutions/tricks. Really not sure what the answer to OP could be...

everybody is a winner in this "contest"

But if I have to pick someone, it'll be MAG

I've been in deep thought about this question ever since I saw this thread yesterday. It's been all I can think about. I've gone back through most of the major TMO threads and rated users based on willingness to help as well as depth of knowledge. I've consulted friends and family members, and even had a chance to organize an independent think tank consisting of some of the industry's top minds. They employed the use of sophisticated algorithms in combination with advanced AI developed solely for the purpose of answering this question.

Strangely enough, all efforts indicate a statistical tie between two TMO members: vi_ and abill_uk.

I personally cast my vote for abill_uk because his exhaustive knowledge of USB port engineering and design pretty much revolutionized this community and showed the world what was possible in terms of USB port troubleshooting.

If I were more of a software person, I would have voted for vi_ because the code in his signature has done so much to help so many.

Lumiaman, natch.

mohamad for his great contribution in our n900 and n9's .
thedead1440 for his fast and helpful posts

I find the fact that people mentioned different and varried users very satisfying. It shows that this community is full of kind and modest people who are willing to help and contribute. They are a the key to the strength of this community and I really hope that they will stay here.

I swear everytime I browse the forum and I see a beginner with a problem I always see a user named michaa-...something (can't remember the exact name) helping out, no matter the level

but in general I agree with the above posts, because when I have a problem and search the forum, 90 percent of the time a solution was already posted