My friend owns a cafe, and it was there that I heard - wrongly - that there was no caffeine in espresso.
What he was really saying was that there is
less caffeine in espresso than in regular coffee. There is more caffeine
per volume in espresso, but how many people are drinking a whole mug of espresso? (Oh yeah, kingpole, I forgot

) Most people are fine with one or two shots.
Oops, I forgot to read Big Al's statement above, anyways...