My short comment:
Kimi ni Todoke is one of the best storys I have ever read. Eventhough I started 4 days ago to read, I already finished reading all 70 chapters that there are up to now. Because once you start it you can't stop it. You just have to know what happens next or you are dying. That's why I would really beg you to not start it yet! I now have to wait a MONTH between the chapters and this is really killing me! So if you haven't started it yet you should wait until the author don't says that it will end soon. I really beg you to not start it until then!

The Story:
The Story is great! The whole plot is wonderful and everything is clear and easy to understand (except the parts where Karuho-sensei the author wanted them to not be understand easy) Karuho-sensei has a great sense of when to put in what and when what has to happen. The only thing that I don't like is that the story is a bit slow. It still has a great suprise rate and everything happens to a perfect time, but until the perfect time comes it needs seven chapters. It's somehow the Dragon Ball Z of the Shoujo. You know, it needs really much time, but once you read it you can't stop. You are dying when you stop and you kill yourself in this time when you have to wait.

The Characters:
The main characters are Sawako and Shouta. Sawako is a really shy girl. She can't smile on purpose and looks kind of scary when she tries. When someone is talking to her she is always kind and touched that people talk with her. Her character is really special but once you see what kind of character she has you just love her.
Shouta is the popular guy who goes with Sawako in one class. And I don't think that I am spoiling when I say that he loved her and she loved him since the first moment they saw eachother. But rightnow in the story plot I am really angry at Shouta. He is a typical boy with a touch of cuteness. But rightnow I don't like him. I hope the story shows soon why he is the way he is now, and I personally think that there will soon be sex between them. Yes I just said that. And I regret nothing, once you read the story I gues you will see it the same way.
Sawakos two friends Yano and Ayane are great characters and have there own personallity that is completly different from eachother. This is also a reason why I love this manga so much: Every character has it's own personallity.

The Art:
The Art is the most wonderful and funny thing about the whole Manga. Most of the time it's drawn in Chibi and and the characters get funny expressions. The outstanding people are drawn in shapes of people, what is good because this way you can't lose the sight of the main characters. In moments of personal or serious stuff the characters are drawn like angels, I really admire Karuho-senseis way of drawing. The eyes aren't big like apples, the boobs aren't big like watermelons and bouncing like a ball, and the hair has a normal physikal appility. I love the Art!

Overall:
All in All Kimi ni Todoke is the best Shoujo Manga in the world. It has a sweet story and perfekt characters. It is really great. But like I said above: Don't read it if it isn't finished yet. I am dying, I don't want my Otaku friends to die too. This waiting is really killing, but if you don't want to listen I can totally understand. It is the best Shoujo Manga in the world, I would read it too if I haven't. Good luck and much fun!!