Last night, I released an other small library, which allows you to use the Yahoo! PlaceFinder Webservice with Flex and ActionScript3. The library is based on Parsley, because I have developed the library for my Last.fm projects which use Parsley as application framework.
Yahoo! PlaceFinder Webservice allows to find addresses based on address parts or GPS geolocation information (latitude and longitude).
An example, the documentation and the library can be found here.