I am A critic for the "Suggestion Forum" and have a personal list of GREAT SUGGESTIONS! But..... I Have No Idea How To Get Them To Jeb so he can see your great ideas.
An Email address Would Be Very Helpful.
-The Critic That Bothers To Look Through 50 Pages (1250 Topics)Of BullSh*t.
"You" don't contact Jeb. If he wasted all his time listening to every player that had a suggestion there would never be another update because he wouldn't have time to work on the code.
He actually does respond to users on twitter. Its all over his wall. Ive heard notch uses reddit from time to time as well, but from what I've heard they almost never come on these forums. but as I said before, please dont spam him with suggestions, because the more junk he gets, the less likely it is he will listen to us in the future.
If you have suggestions to make, try the suggestions section; see how others think about it before you try to contact someone in Mojang.
Anyways, I believe it is better to contact Dinnerbone than Jeb if you have suggestions to make.