To get a bit irritated when I get given cards signed by friends who add the name of their partner whom I don't know very well.

[madonnawhore]

That, really.

I like my best friend's boyfriend but we're not really close or anything and I don't see him that often. It kind of annoys me when she gives me birthday or Christmas cards and signs them from her and him. It's like, I don't really know him and I know he isn't especially bothered about my birthday or wishing me well in my new home or anything. Why can't she just sign it from her, since she's the person I have the relationship with?

Anyone else get irritated with '&' couples?

I am with you, I only find it mildly annoying and, I think, a bit smug.

I don't put DH's name unless he is actually friends with the person the card is to.

This would slightly annoy me if I had never or rarely met the partner and they hadn't been together for a long time. The only time it would get above a mild annoyance though, would be if it was from an ex I had stayed friends with. It wouldn't be jealousy, it would just feel a bit weird.

YABU

One of our friends is due to become a father in the next fortnight or so. I've never met his wife (neither has my husband), should we miss her off?

That said, I occasionally (to very good friends) will sign "Love Zillion and to a lesser extent Mr Zillion".

zillion, I received a new baby card just like that. It was addressed to "mr picklesarnie and partner"!!! So they went to the effort of buying a card and getting our address off the MIL but didn't bother their arses to find out the name of the 'partner' that had just spent 23 hours pushing said new baby out of My bits.

Good lord OP, you must have a really dully life if you can get annoyed by this. There is nothing wrong with feeling like a couple. I fact it is very nice.

Perhaps I ought to get cross when people add their dog to a card!

If you are married and you send a card to someone who knows both of you but only sign it from yourself they will think your DH has a problem with them.
If it were a personal email or a letter then sure, no need to add partners, but cards are just a convention. If you think he would say happy birthday to you or Merry Christmas then he knows you well enough to have his name on your bday or xmas cards.
YABU