Today I spent about 2 hours validating that the computer-generated indexes already created — and not all 50 states are yet done — were accurate. I worked on Indiana, Oregon, and Arizona. Technology has come such a long way in the past 10 years; I am amazed at how accurate the indexed data appears already.
You can validate names in a given state, or, if the name validation is complete, you can validate family groups. And the cool thing is you can select names, so for the family groups I was validating (in Oregon and Arizona) I specifically searched for COPPLE households. (And recognized some of the names I already have in my COPPLE tree on Ancestry.com)
There is plenty to do for anyone interested, and you can do just a little bit or do a lot — any amount helps get the indexing done faster.