Last night we watched Toy Story 3, and I blubbed like a baby!
Films guaranteed to make me cry, either with sadness or happiness are:
Return to Me (David Duchovny, Joely Richardson, Minnie Driver)
ET (Classic)
Boys Don't Cry (watched this once, will never watch again as it stayed with me so vividly, upset me so much)
Stepmom (soooo sad)
Can't think of any more right now but I know there are tons.