FlickrExport for Aperture provides a comprehensive set of features for getting your images from Aperture to Flickr:
FlickrExport for Aperture 1.0.9 may be downloaded from this link.
Release notes for FlickrExport for Aperture are available.
FlickrExport for Aperture is a separate product from FlickrExport for iPhoto and requires a serial number specifically for that product. Serial numbers purchased for FlickrExport for iPhoto will not work in FlickrExport for Aperture.
It is not intended that FlickrExport for iPhoto be a "lite" version of FlickrExport for Aperture. Each product will have as many features as can be implemented within their respective host applications. However, since Aperture and iPhoto are distinct applications, the existence of any feature in FlickrExport for Aperture should not be taken as implying that a similar feature will be implemented in FlickrExport for iPhoto, nor vice versa.