Here's a collection I made in this forum a few months ago, only tear-jerkers (IMO). Check through the list, i'm sure you'll find something! Most of the animes in my list probably has some sort of romance, or something that makes you grow very attached of the characters. Clannad and the other Key animes are like the mothership of all tear jerkers, so it's hard to find something that are quite as good those, but every anime on my list have at some point during the anime made me cry, some more than others of course.
http://forums.animesuki.com/showthread.php?t=116182