We use geonames.org for that purpose. For us, the big thing that Placefinder does that geonames.org can't do is geocoding free-form input. That's a very difficult thing to do well (especially when it comes to international addresses), and Placefinder is the only free, or reasonably-priced, service I've found that's decent at it.
QUOTE(DougS @ 3 Oct 2012 5:55 PM)
Mason, just curious what you use as a fallback for Placefinder. We've been unsuccessful in finding another good service that provides what we want. Ours is a simple request, send the zipcode to Placefinder and return the city, state, county.
Thanks