I dual box as well with a Resto druid and mage. I generally don't advertise the fact that I am dual-boxing until after the run. Most of the time people don't realize that I am doing it, and I hope that I can change perceptions due to successful runs. Of course if someone asks I tell them I am boxing. Also due to the lack of healers, I think people are more willing to take my healer + 1 dps.