Same here. Heck, I don't even get my parents anything--partly because their unhappy marriage made for my unhappy childhood, and I still can't bring myself to celebrate it (but that's another story). Still, at most I'll say "happy anniversary" or "congratulations" to someone if it comes up. Otherwise, I just don't feel like it's mine to celebrate. If I was really close to the couple, I certainly think a nice card would suffice.