BD Biosciences Clontech recently announced that it has launched RNAi-Ready pSIREN-RetroQ-ZsGreen and pSIREN-DNR-DsRedExpress vectors, which provide fluorescent markers for monitoring the efficacy of gene silencing construct delivery.
Details about the products can be found at http://www.bdbiosciences.com/clontech/archive/JAN04UPD/fluorescent.shtml.