new section added in today's edition of the 3.5 fact explains how TWF
(two weapon fighting) and a monk's FoB (Flurry of Blows) works!
To add an off-hand attack to a flurry of blows, stack
whatever two-weapon penalty the monk has with the penalty (if
any) from the flurry. Attacks from the flurry have the monk's
full damage bonus from Strength, but the off-hand attack gains
only half Strength bonus to damage. If the off-hand attack is a
weapon, that weapon isn't available for use in the flurry (if it
can be used in a flurry at all, see the previous question).