You can download the videos through the LR Podcast:http://rss.adobe.com/www/special/light_room.rss
There are some great audio discussions in there with many of the engineers behind LR too.
I have a fast cable connection, but the Adobe server may be overloaded. At times, the Quicktime video halts until the server can respond, and viewing is not satisfactory. It would help if someone coule supply the URL of the tutorials for downloading to one's own computer for later viewing. The above URL does not work for me. HTML code displays when I click on that link.