  We compute superpotentials for quiver gauge theories arising from marginal
D-Brane decay on collapsed del Pezzo cycles S in a Calabi-Yau X. This is done
using the machinery of A-infinity products in the derived category of coherent
sheaves of X, which in turn is related to the derived category of S and quiver
path algebras. We confirm that the superpotential is what one might have
guessed from analyzing the moduli space, i.e., it is linear in the fields
corresponding to the Ext2's of the quiver and that each such Ext2 multiplies a
polynomial in Ext1's equal to precisely the relation represented by the Ext2.
