I at least always give a card to someone if they invite me to their wedding. Not always money (we try) but I don't feel bad if all I can give is a card.
As for people in your wedding party, maybe to some it's a social faux pas for them to not get you anything, but they did you the honor of standing up for you in your wedding, planning (and paying) for parties for you, for their hair and make-up, their clothing, etc. They also were instrumental in making sure your day went smoothly, most of the time. To me that's more than enough thanks and a gift, and not receiving a card wouldn't bother me in the slightest. They've already spent enough, really.
Personally, I don't care too much who gives a card and/or a gift, and who just shows up and has a good time. Everyone is not like me, I understand that, but my family just being there is enough for me to be happy.. not to mention that they'll have all had to fly across the country just to see me get married. I don't expect an extra 100 on top of that, or hell, even a card, after they have made the effort to be at my day. If they do, it's a nice gesture, I just know I won't be offended.
My advice to any other brides is, if it does upset/offend you for this sort of breach of etiquette to occur, please try to bear in mind that a lot of things can be going on in people's lives that could have affected whether or not they gave you a card or a present, things you don't know about. The only thing you can really do though is just suck it up and pretend like it doesn't bug you, because if you did make a big deal out of it you could appear to be ungracious and greedy, even if it's just the etiquette that upsets you about it.
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