Tipping Etiquette

Tipping is always an interesting topic and many people are curious to know what others tip. We want to tip appropriately. Should you still tip when it says no tipping required, or tipping included with cost of trip? (i think not)
What is the amount you should tip for different services? (a bit of guildline at the end of this post)
Something I have found that helps me is to decide what I can afford to tip on a trip and put that money aside before we leave on the trip. Ideally it is nice to exchange your money to the currency of the country you travel to, this way the local people are saved a trip to the bank and possibly the inability to cash a bill that is damaged and they usually cannot exchange coin from another country When the currency is not available in your country it is nice to buy small U.S. bills at the bank. I like the idea of tipping the same way I would here at home in Canada. I have also heard of people that tip one large amount in the beginning of the week and then again at the end, and this method works well they say. I have not tried this method. It does sound like a nice way to avoid carrying money with you every day. Some of the information I have located about tipping:
Taxi Drivers: 15% of total fare, but no less than $1
Waiters/Waitresses: 15% - 20% of amount before taxes
Bartenders/Cocktail Servers: 15%-20% of total bill before taxes, or $1 per drink
Hotel Maid: $2-5 per person in a room per day, more if extra cleanup is involved
Tour Guides: $5 per tour or 10%-20 of the tour cost
Baggage Handlers: $1-2 per bag