I've watched/read so many that I can't list them all, I would have to use myanimelist as a reference (haven't updated it for a while), here are the current ones that I'm into though:
Yotsuba&! (manga)
Great series if you need some comical relief, no sexual stuff, it's pretty innocent manga focused around a little girl exploring each day as it comes.
Katekyo Hitman Reborn! (manga/anime)
If I had to recommend one of them, I would say the manga, the anime censors too many scenes in my opinion. The story starts out with mostly comedy for the first 70 or so chapters. The author, Akira Amano, decided to change the style and direction the plot line was going in volume eight though, giving it a more serious tone and the action scenes are pretty well drawn.
The World Only God Knows (manga)
Centers around an otaku who loves dating SIM games, he makes a deal with a demon to make girls fall in love with him so that the demon can capture the evil spirits within them. I described it pretty morbidly, but the story actually has a pretty whimsical tone.
That's as much as I can type with my left hand without getting a cramp XD. I'll try to add more if I get the chance.