iPlayer Downloader allows Mac users to download DRM-free content from the BBC's iPlayer service. This app is not endorsed by or provided by the BBC in any way. Not only can you download TV shows, but you can also download radio shows, all in either H264 .mov QuickTime files (for TV content) or MP3 files (for radio). You can also use a proxy connection to download the files, although usage of this feature may not be in accordance with the BBC's Terms of Service; it is down to you to ensure your compliance with them.
Mac OS X 10.5 PPC,
Mac OS X 10.5 Server,
Mac OS X 10.5,
Mac OS X 10.5 Intel
||You must be resident in the UK to use the BBC iPlayer service, although if you use this app you can specify a proxy server if you're not in the UK. This may not be in accordance with the BBC's ToS; this is your concern, not ours.