How much caffeine is in my espresso?

Since I was wondering and thought other folks might be as well, here's a list of caffeine contents of the stuff we're drinking at eating, culled together from a few sources on the web:

Drip coffee                 115-175 mg
Double espresso                120-150 mg
Brewed coffee                80-135 mg
Starbucks Chai Latte        100 mg
Black Tea                        40-50 mg
Pepsi (12 oz)                   38-45 mg 
Oolong Tea                     30 mg
Green Tea                        20-25 mg
Dark Chocolate (1 oz)           20 mg
White Tea                        15 mg
Milk Chocolate (1 oz)            6-8 mg

All tea measurements are based on one tea bag.

I wasn't able to find a good measurement for Mate tea, which seems to vary widely.