Fucking Lamers -
Tipping for a massage by a certified massage therapist session should be consistent with that of how you would tip a barber or hair stylist. It should be in the range of 10-15% if you're really happy about the service.
Regardless of what some of you think about tipping, it IS very much the norm in that industry. However, I am sure massage therapists realize that alot of people probably don't think about tipping.
These thoughts... from someone who's a great tipper.
Brad