Spice and Wolf was pretty lighthearted in my opinion, it had only few tense moments and even those were all solved peacefully without any bloodshed.
So you want more description? OK let's see:
Kanon2006,
Air and
Angel Beats are basicly the same as Clannad since they are from the same author what means series have romance, comedy, drama, friendship... Angel Beats has a bit of action though and has aweasome soundtracks.
AnoHana is about a group of friends who had seperated ways after one of them had died in an accident. Now her ghost is trying to bring them back together.
Aoi Hana is about two childhood friends. Hard to explain but it is a light yuri romance with males present
Aria the animation are series about group of girls that try to become the best undine (they are taking people on tours in a boat)
Bakuman are series about two guys that try to become proffesional manga artista. Series also have light romance going on.
Dog Days are series about a different world where they had summoned human from our world to be their hero and help them in war. However, it is not the typical war with bunch of blood and death. It is an innocent game where no one dies, it is jusr for fun. Series are mostly about friendship.
K-ON is about group of girls that have created a music club. So basicly series are about their everyday life and on how they try to become a real big band. Though they slack more than work
Kaichou wa Maid-sama! is a romance comedy about a girl who is a chool president and very feared by guys. But she has a secret, she works in a maid cafe and one of the guys discovers her secret.
Kami nomi zo Shiru Sekai are series about a date game freak who accidently signed a contract with a cute demon. Now he has to date girls in real life if he wants to keep his head. He always comes up with bunch of strategies to win the girl over.
Love Hina is a harem/comedy show. It is about a guy who is living in an all girl Inn. Half of girls is happy to have him and part is not. He is also a loser who can't get into Uni but he keeps improving. He is in love with one of the girls there. There are a lot of things going on, though manga is much better.
Maria-sama ga Miteru is a slice of life yuri show. It is about an all girl school and characters interections and relationships with each other. It is hard to give it an explanation.
Mayo Chiki are series about a guy who has girl phobia and starts to nosebleed whenever a girl touches him. He accidently discovers that one of the girl's buttler is actually a girl. The mistress of a buttler makes a deal, if he will be quiet then they won't hurt him and will help him to get rid of his phobia.
Shugo Chara! is a magical girl show. Basicly everyone has their future would be self which are sleeping inside of everyone. An evil organization is searching for a specific egg and good group of friends is trying to stop them. There are a lot of things going on but it is a basic explanation. Some romance is included.
Sora no Woto are series about group of military girls and their everyday and peaceful life.
Spice and Wolf are series about two people. A trader and half fox woman who he has found in his carriage. Series are about their journey, romance included.
Toradora! is about a guy who is in love with the girl but she thinks of him as a friend. And there is another girl who is in love with another guy but he also sees hee only as friend. The two rejected souls join the forces and try to win their others halfs over.
Usagi Drop are slice of life series about a man who had adopted a small girl.
Working! are comedy series about group of people that work in a restaurant. a bit or romance included.
From ongoing series you can try to keep up with:
Chihayafuru are series about japanese card game. A group pf three used to play cards together but then they grew up and their ways seperated. The female lead believes that if she will keep playing cars, they will eventually meet again.
The iDOLM@STER are series about group of girls that try to become stars. First 5 episodes wre not that great but later series started to get better. Basicly each episode is about one of the events and work placements that they have tried.
Hope this helps^^