An article just came out in the Fall 2007 Modern Bride to address this. It’s a commercial source, so I’d take these with a grain of salt (to me, tipping should never be expected for instance). Page 154 in the how-to guide. It has three categories: contract tipping, expected tipping, and your call.
Waitstaff – parties of 20 or more a 20%(ish) gratuity is added.
Transportation – 20% of the total cost
Reception staff – 18-20% of the total bill
DJ/Musicians at Reception – 5-20% ot the total cost
Delivery Truck Drivers/Setup – $5-$25 per person depending on the difficulty of the task
Organist/Music for Ceremony – $20-$25 for each musician
Officiant – $100 and up or a donation to church or synagogue
Reception-Hall Manager/Maitre d’ – $40 or more for each staff member(depending on size of event)
Waitstaff at Reception – $20-$25 per person or 10% of the total for bar tenders
Powder Room, Coat Check and Parking Attendants – 50 cents-$1 per guest
Hair Stylist/Makeup Artist – 15-20% of the total cost
Photographer, Florist, Caterer, Baker, Jeweler, Videographer, Stationer, Consultant, Seamstress, Tuxedo consultant, Bridal shop consultant, Travel Agent
Okay, now that I took the time to type all that out, it seems a little ridiculous and over the top. I grew up thinking (and this is thanks to the game of Monopoly) that the only person to be tipped is the Officiant and that’s because it’s supposed to be a free service. But nothing should be expected unless it’s included in the contract.
I did a little more research and here’s a consultant’s association protocol on tipping.
Clergy Member – usually a donation ($10 and up) depending on ceremony size
Public Official – Usually a flat fee ($10 and up). Some aren’t allowed to accept money
Ceremony Assistants(altar servers, sextons, cantor, organist) – often covered by church fee, but ask. $5-$25
Floris, baker, photographer, musicians, limosuine drivers – 15% for drivers: other tipped only for extra-special service
Reception Staff(waiters,waitresses, bartenders, table captains, maitre d’) – 15% for servers, 1-2$ for captains, 15-20% for maitre d’
Powder Room attendants/Coatroom attendants – 50 cents per guest
Hope that helps!