Ancestry.com doesn't seem to have many associated apps, but I just got a promo in the mail for this free one, and I LOVE it. It's called shoebox, and you use it to link to your ancestry.com account with your phone, and then you take a picture of a picture, enter in which person in your tree it goes with, and you're done! It's perfect for cataloging family pictures your Mom won't let you take with you, or in my case, are too fragile to be taken out of their frames for scanning.
Here's the app:
http://shoebox.ancestry.com/?o_xid=56206&o_lid=56206&o_sch=Email
Here's the app:
http://shoebox.ancestry.com/?o_xid=56206&o_lid=56206&o_sch=Email