Ok so here's what I've figured out. Download Net Transport from the link above and install. go to this website:
Nasa Webcasts
Right click on you choice of real media, preferably High. save the .ram link to your desktop.
Go back into Net Transport, go to File/Import, change the file type at the bottom to "all files". Find the Real PLayer file that you saved and click on it. Click "ok" in the box that opens, and you are downloading.
Easy as that.
PS: you can download using Net Transport and watch the webcast through windows media at the same time, so sign me up for a division for friday and saturday.