Family Search just posted a new Michigan database: Michigan, Eastern District, Naturalization Index, 1907-1995. Before you get too excited, this database has not yet been indexed, but you can browse through the cards. It is arranged by Soundex code so you'll need to determine the codes for your surnames.
You can determine the soundex code using the Rootsweb converter here.
While this index is too recent to help me with my people, I took a look at a few of the cards to see what information is on them. The answer is not much. You'll find the name of the petitioner, the birthdate, the date of the petition and either a number or Vol/Pg to locate the actual record.