I've just put up version 1.5.2 of my class up on SourceForge. This version fixes a minor bug in contacts_getList() and contacts_getPublicList. It also adds the new privacy_filter argument to photosets_getPhotos. If neither of these affects you, there isn't much reason to update.
If you see any API methods or arguments that I haven't implemented yet, please send me an email to let me know that I've missed something. Sometimes Flickr doesn't announce new functionality for a while (if ever).