We describe the current status of the MILC collaboration computation o
f f(B), f(Bs), f(D), f(Ds) and their ratios. Progress over the past ye
ar includes: better statistics and plateaus at beta = 6.52 (quenched),
beta = 5.6 (N-F = 2) and beta = 5.445 (N-F = 2), new runs with a wide
range of dynamical quark masses at beta = 5.5 (N-F = 2), an estimate
of the systematic errors due to the chiral extrapolation, and an impro
ved analysis which consistently takes into account both the correlatio
ns in the data at every stage and the systematic effects due to changi
ng fitting ranges.