When comparing incandescent to spiral fluorescent (CFL), use the actual wattage of the incandescent, and the "equivalent to" wattage of the CFL which is displayed on the package.
For example, a 23W CFL is "equivalent to" a 100W incandescent, a 13W CFL = a 60W incandescent, etc.
I recently saw some incredibly tiny CFLs at Lowe's. Smaller than any others I've seen, including the ones Wasserpest linked. Had to stare at them for a minute and say "wow", but I'm afraid I can't remember the brand.