When drow was released, they were a bit overpowered for alot of classes. At this point there are very few times when a drow is the way to go. I say its time for the drow's inherent SR to be added. It is pure junk as an enhancement, but since it is available from a cleic spell and monk class, I see no reason not to give it to the drow. Especially since it is inherent as the race.
I know some would point out that drow do not take a negative when being in sunlight in ddo, but adding the SR at this point would not make drow an uber class. It would give them however a little more to compete with against other classes.
Turbine fixed warforged by giving them their inherent immunities vs keeping them as an enhancement, please do the same for drow.