Full Metal Panic! Pretty much every episode Kyoko shows up in, she's taking a picture with her digital camera.
Lucky Star episode 8 has Konata's dad being the slightly creepy old guy taking pictures of young high school girls.
Ranma 1/2 episode 4. Nabiki takes photos of girl-Ranma and Akane to sell to Kuno for great profit.
FLCL episode 3 has Mamimi taking pictures of herself and Naota by the river.
Kimagure Orange Road has a few episodes where photography is featured. After all, Kyosuke's father is a professional photographer. Episode list (this should be most of them): 1, 8, 16 (ok, they were taking a picture of an UFO), and 35. And there is the little intro at the beginning of each of the first 19 episodes.
Ai Yori Aoshi has a bunch of episodes where people take pictures of others. Kaoru's college schoolmates are in the photography club so there many instances. Particularly episode 5 of the first season, and the final 2 of Enishi.
The Melancholy of Haruhi Suzumiya has a few episodes. Specifically, (DVD order) episodes 3, 4, 10, and 14.
Suzuka episode 10.
K-On! has a few scenes where there are picture taking. Episode 1 has a quick bit at the end, and episode 3 has a few more.
Sora no Manimani has a few scenes with Edogawa, the photo club member hanging out with the astronomy club (essentially an unofficial member) and taking photos. Episode 4 has him taking pictures during their trip. Episode 1 also features Saku's mom taking pictures of him as he leaves for his first day at high school.
Hyakko has various scenes with picture taking starting with episode 5 and 7 onwards.
Toradora episode 25. Pretty sure it's a cellphone camera that's being used.
Nyan Koi! episode 5 has Nagi taking a bunch of pictures with her cellphone of Junpei and Kaede together.
Canaan features Maria and Minoru, both photographers. Early episodes are best.
Eden of the East features a few episodes where various characters take pictures with cellphones.
Cross Game episode 21 has Mizuki taking a picture of Aoba with his cellphone.
EDIT: fixed grammar.