How Much Should You Tip for Various Services?

Do you consider yourself a good tipper? We have rounded up some tipping guidelines.

I have just learned that I am a horrible tipper. It is with great regret that I must issue a blanket apology to all of the people who have provided services to me over the years.
Here are the guidelines from Emily Post for tipping:

RESTAURANTS:
Waiter/waitress at a restaurant 15-20%
Home Delivery 10-15% of the bill
Pizza delivery $2-5
Bartender $1-2 per drink
Tipping jars No obligation
Restroom Attendant $0.50-$3 depending on the level of service
Valet $2-$5
Coat checker $1 per coat upon retrieval.

Grocery bag boy: $1 for bringing bags to car; $1.50 to $3 if you have more than 3 bags

TRAVEL:
Skycap $2 first bag, $1 per additional bag
Doorman $1-$4 for carrying luggage
Bellhop $2 first bag, $1 per additional bag
Housekeeper $2-$5 per day
Concierge No obligation for answering questions $5-10 for tickets or restaurant reservations
Taxi driver 15-20% of the fare, but minimally $1 $2 for the first bag, $1 for the second
Tour Guides: 15% - 20% + depending on quality (knowledge, friendliness, etc)

SALON/SPA:
Hair Salon 15-20%, ask to be split among those who served you
Manicurist 15-20%
Facial, waxing, massage 15-20%

GAMBLING:
Dealers at Table Games in the Casinos: 5% of bet amount at end of session.
Slot machines host: $5-10.

Furniture deliverer $5-$20.
Mover $10-$25 per person