I found a good link with lots of ads for massage, here is
http://www.naalee.com/data/_cinfo/li...6_reset_1.html
I have tried a couple girls based on ads I found in other websites. Generally, the girls are OK looking and services are acceptable. But please be careful when meeting these girls and place your expectations (for their looks and services) lower.
I will definatly try out some of them when I return to Beijing soon.