get_iplayer is fully maintained by infradead.org now.
You can download it from
infradead.org/get_iplayer/
I have been using it for quite a while on my mac (via Terminal.app) and I've already used it to downloaded over 160GB of TV series episodes of the BBC (technically it's more like over 120 because for programmes that are available in both SD and HD resolutions, I download both) so this past/latest Top Gear series 16 (broadcast between January 23rd and February 27th 2011) I do keep both, so for top gear that would be 630-odd-something MB for the SD-version and the 1,12/1,15GB for HD version.