Apple iPhoto (Mac)
You can upload photos to a Zenfolio account directly from the latest Apple iPhoto '09 on Mac OS X.
iPhoto to Zenfolio Exporter was written using the Zenfolio Public API and it provides a streamlined interface for selecting, processing, and uploading any number of photos. Metadata such as captions, titles, and keywords are uploaded as well, and you can have photos automatically resized and converted to a different format before uploading.
The download includes a self-contained installation program for Mac OS X. Download it to your computer and double-click to install.
Once installed, choose Export from the File menu in iPhoto and then select the Zenfolio tab.
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