Family Tree DNA's successor to Population Finder, myOrigins is now in secret beta. This is not a review of the product. That will come after I have time to complete a more thorough test drive. At first glance it has many interesting features.
If you do have access to the product during the beta test, I encourage you to test it thoroughly and report any bugs or difficulties, along with any other comments, directly back to the design team promptly. All of us will benefit if this product can be made better.