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Units of dBm are decibels relative to 1mW of power.

0dBm = 1mW
3dBm = 2mW
6dBm = 4mW
9dBm = 8mW
12dBm = 16mW
15dBm = 32mW
...
20dBm = 100mW
23dBm = 200mW

Orinoco/Enterasys cards are 15dBm
Cisco 350's are 20dBm
Senao and Demarc have some 23dBm cards