You can send an e-mail with questions about the usage of Addresses to: support e-mail
If you have discovered a bug in the program, please report this to: bugreport e-mail

FAQ

Does Addresses synchronize with the iPhone via iTunes or iCloud?

Yes, Addresses uses the native systemwide address book programming interfaces, these are compatible with both iTunes and iCloud.

Note that there are compatibility issues between using iCloud and iTunes syncing. Essentially, if you use an iPhone without iCloud support, do not enable iCloud support on your Mac as the syncing is done between the local address book (which is separate from the iCloud version) and the phone. Worst case you get duplicated contacts in the list. Note that this behavior is identical to the OS X address book application.

Does Addresses support CalDAV/Exchange/iCloud?

Addresses uses the standard address book programming interfaces. These work with iCloud, CalDAV, On This Mac and Exchange based contacts. LDAP most likely works as well, but it has so far not been tested.

How do I set the default account for where contacts are created?

This can be done in the Address Book application that came with Lion. Start it up and open the preferences. In the preferences window, select the general tab and then select the account next to the Default Account popup.

Addresses does not restore the window sizes, help!

This was a problem for users who had disabled automatic window restore in the system preferences. The problem was addressed in Addresses v1.1.1. Please update the program using the Mac App Store.