Vicky asked me to chime in on her post about bridal shower planning. Honestly, I know little about them. I didn't want one and didn't have one. So... take Vicky's advice.
One thing I'd say is it seems like a best friend or MoH throwing a bridal shower has to partly remove the emotional part of it and become a party planner, keeping "the client" in mind. If your friend is going to be horrified by bridal bingo and ribbon bouquets, then don't do those. Make sure the theme of the party is clear on the invitations. And maybe warn some of the younger guests if there will be great grandmothers present. Racy lingerie will probably make Great Aunt Edna blush and giggle, but anything naughtier might be inappropriate.
If nothing else, get a customized figurine of the bride. According to this site, it makes a great bridal shower gift.