Simple Mailing List Database

I work with a small non-profit that maintains two very simple mailing lists, used once a year. The lists contain only Name, Address, City, State, Zip fields and are printed to standard Avery address labels. Each list is about 300 records.

Currently the lists are kept in FileMaker, but moving them on to Leopard would probably entail having them update (they are using FileMaker 7.0 at present) which seems a large expense for such minor use.

Anyone know of any simple databases that would serve? Use OS X Address Book??

Thanks in advance for your kind attention,

I think address book would work fine for this, as long as they don’t need to access it from multiple computers. (Although you can use .Mac for that, I guess.)