The great FREE site Mocavo is merging with Find My Past and soon Mocavo will be gone. However, they have made a promise that their records will be FREE FOREVER and intend to hold true to their promise regardless of who holds their data. So Find My Past appears to be soon having access to indexed US records, including Census records, yearbooks, and many other miscellaneous documents.
I'm pleasantly surprised that Find My Past is keeping the Mocavo records free and I anticipate that this will make me more likely to use their site in the near future.