I don't know any Mac users but if you do this sounds good for them.
iSwipe searches AND downloads from the Web, and the FTP, Hotline, Napster, OpenNapster, Gnutella and AudioGalaxy networks. It also searches the Carracho network. It includes a download manager, featuring retries and resumable downloads, and 4 slots each for FTP, HTTP/Gnutella, Hotline and Napster downloads, and a single slot for AudioGalaxy. It also includes an AutoSearch feature, which keeps a list of those elusive files that you want and can never find online, and an automatic feature to add all tracks from an album of music.
http://homepage.mac.com/hillmanminx/iswipe/index.html